Add user connections, notification centre, and people integration

Implements the full User Connections & Notification Centre feature:

Phase 1 - Database: migrations 039-043 adding umbral_name to users,
profile/social fields to settings, notifications table, connection
request/user_connection tables, and linked_user_id to people.

Phase 2 - Notifications: backend CRUD router + service + 90-day purge,
frontend NotificationsPage with All/Unread filter, bell icon in sidebar
with unread badge polling every 60s.

Phase 3 - Settings: profile fields (phone, mobile, address, company,
job_title), social card with accept_connections toggle and per-field
sharing defaults, umbral name display with CopyableField.

Phase 4 - Connections: timing-safe user search, send/accept/reject flow
with atomic status updates, bidirectional UserConnection + Person records,
in-app + ntfy notifications, per-receiver pending cap, nginx rate limiting.

Phase 5 - People integration: batch-loaded shared profiles (N+1 prevention),
Ghost icon for umbral contacts, Umbral filter pill, split Add Person button,
shared field indicators (synced labels + Lock icons), disabled form inputs
for synced fields on umbral contacts.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/alembic/versions/039_add_umbral_name_to_users.py

@@ -0,0 +1,37 @@
+"""Add umbral_name to users table.
+
+3-step migration: add nullable → backfill from username → alter to NOT NULL.
+Backfill uses username || '_' || id as fallback if uniqueness conflicts arise.
+
+Revision ID: 039
+Revises: 038
+"""
+from alembic import op
+import sqlalchemy as sa
+
+revision = "039"
+down_revision = "038"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # Step 1: Add nullable column
+    op.add_column("users", sa.Column("umbral_name", sa.String(50), nullable=True))
+
+    # Step 2: Backfill from username (handles uniqueness conflicts with fallback)
+    op.execute("UPDATE users SET umbral_name = username")
+    # Fix any remaining NULLs (shouldn't happen, but defensive)
+    op.execute(
+        "UPDATE users SET umbral_name = username || '_' || id "
+        "WHERE umbral_name IS NULL"
+    )
+
+    # Step 3: Alter to NOT NULL and add unique index
+    op.alter_column("users", "umbral_name", nullable=False)
+    op.create_index("ix_users_umbral_name", "users", ["umbral_name"], unique=True)
+
+
+def downgrade() -> None:
+    op.drop_index("ix_users_umbral_name", table_name="users")
+    op.drop_column("users", "umbral_name")

backend/alembic/versions/040_expand_settings_profile_social.py

@@ -0,0 +1,85 @@
+"""Expand settings with profile, social, and sharing fields.
+
+Revision ID: 040
+Revises: 039
+"""
+from alembic import op
+import sqlalchemy as sa
+
+revision = "040"
+down_revision = "039"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # Profile fields
+    op.add_column("settings", sa.Column("phone", sa.String(50), nullable=True))
+    op.add_column("settings", sa.Column("mobile", sa.String(50), nullable=True))
+    op.add_column("settings", sa.Column("address", sa.Text, nullable=True))
+    op.add_column("settings", sa.Column("company", sa.String(255), nullable=True))
+    op.add_column("settings", sa.Column("job_title", sa.String(255), nullable=True))
+
+    # Social toggle
+    op.add_column(
+        "settings",
+        sa.Column("accept_connections", sa.Boolean, nullable=False, server_default="false"),
+    )
+
+    # Sharing defaults
+    op.add_column(
+        "settings",
+        sa.Column("share_preferred_name", sa.Boolean, nullable=False, server_default="true"),
+    )
+    op.add_column(
+        "settings",
+        sa.Column("share_email", sa.Boolean, nullable=False, server_default="false"),
+    )
+    op.add_column(
+        "settings",
+        sa.Column("share_phone", sa.Boolean, nullable=False, server_default="false"),
+    )
+    op.add_column(
+        "settings",
+        sa.Column("share_mobile", sa.Boolean, nullable=False, server_default="false"),
+    )
+    op.add_column(
+        "settings",
+        sa.Column("share_birthday", sa.Boolean, nullable=False, server_default="false"),
+    )
+    op.add_column(
+        "settings",
+        sa.Column("share_address", sa.Boolean, nullable=False, server_default="false"),
+    )
+    op.add_column(
+        "settings",
+        sa.Column("share_company", sa.Boolean, nullable=False, server_default="false"),
+    )
+    op.add_column(
+        "settings",
+        sa.Column("share_job_title", sa.Boolean, nullable=False, server_default="false"),
+    )
+
+    # ntfy connection notifications toggle (gates push only, not in-app)
+    op.add_column(
+        "settings",
+        sa.Column("ntfy_connections_enabled", sa.Boolean, nullable=False, server_default="true"),
+    )
+
+
+def downgrade() -> None:
+    op.drop_column("settings", "ntfy_connections_enabled")
+    op.drop_column("settings", "share_job_title")
+    op.drop_column("settings", "share_company")
+    op.drop_column("settings", "share_address")
+    op.drop_column("settings", "share_birthday")
+    op.drop_column("settings", "share_mobile")
+    op.drop_column("settings", "share_phone")
+    op.drop_column("settings", "share_email")
+    op.drop_column("settings", "share_preferred_name")
+    op.drop_column("settings", "accept_connections")
+    op.drop_column("settings", "job_title")
+    op.drop_column("settings", "company")
+    op.drop_column("settings", "address")
+    op.drop_column("settings", "mobile")
+    op.drop_column("settings", "phone")

backend/alembic/versions/041_create_notifications_table.py

@@ -0,0 +1,57 @@
+"""Create notifications table for in-app notification centre.
+
+Revision ID: 041
+Revises: 040
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects.postgresql import JSONB
+
+revision = "041"
+down_revision = "040"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "notifications",
+        sa.Column("id", sa.Integer, primary_key=True, index=True),
+        sa.Column(
+            "user_id",
+            sa.Integer,
+            sa.ForeignKey("users.id", ondelete="CASCADE"),
+            nullable=False,
+        ),
+        sa.Column("type", sa.String(50), nullable=False),
+        sa.Column("title", sa.String(255), nullable=True),
+        sa.Column("message", sa.Text, nullable=True),
+        sa.Column("data", JSONB, nullable=True),
+        sa.Column("source_type", sa.String(50), nullable=True),
+        sa.Column("source_id", sa.Integer, nullable=True),
+        sa.Column("is_read", sa.Boolean, nullable=False, server_default="false"),
+        sa.Column(
+            "created_at",
+            sa.DateTime,
+            nullable=False,
+            server_default=sa.func.now(),
+        ),
+    )
+
+    # Fast unread count query
+    op.execute(
+        'CREATE INDEX "ix_notifications_user_unread" ON notifications (user_id, is_read) '
+        "WHERE is_read = false"
+    )
+    # Paginated listing
+    op.create_index(
+        "ix_notifications_user_created",
+        "notifications",
+        ["user_id", sa.text("created_at DESC")],
+    )
+
+
+def downgrade() -> None:
+    op.drop_index("ix_notifications_user_created", table_name="notifications")
+    op.execute('DROP INDEX IF EXISTS "ix_notifications_user_unread"')
+    op.drop_table("notifications")

backend/alembic/versions/042_create_connection_tables.py

@@ -0,0 +1,109 @@
+"""Create connection_requests and user_connections tables.
+
+Revision ID: 042
+Revises: 041
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects.postgresql import JSONB
+
+revision = "042"
+down_revision = "041"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # ── connection_requests ──────────────────────────────────────────
+    op.create_table(
+        "connection_requests",
+        sa.Column("id", sa.Integer, primary_key=True, index=True),
+        sa.Column(
+            "sender_id",
+            sa.Integer,
+            sa.ForeignKey("users.id", ondelete="CASCADE"),
+            nullable=False,
+        ),
+        sa.Column(
+            "receiver_id",
+            sa.Integer,
+            sa.ForeignKey("users.id", ondelete="CASCADE"),
+            nullable=False,
+        ),
+        sa.Column(
+            "status",
+            sa.String(20),
+            nullable=False,
+            server_default="pending",
+        ),
+        sa.Column(
+            "created_at",
+            sa.DateTime,
+            nullable=False,
+            server_default=sa.func.now(),
+        ),
+        sa.Column("resolved_at", sa.DateTime, nullable=True),
+        sa.CheckConstraint(
+            "status IN ('pending', 'accepted', 'rejected', 'cancelled')",
+            name="ck_connection_requests_status",
+        ),
+    )
+
+    # Only one pending request per sender→receiver pair
+    op.execute(
+        'CREATE UNIQUE INDEX "ix_connection_requests_pending" '
+        "ON connection_requests (sender_id, receiver_id) "
+        "WHERE status = 'pending'"
+    )
+    # Incoming request listing
+    op.create_index(
+        "ix_connection_requests_receiver_status",
+        "connection_requests",
+        ["receiver_id", "status"],
+    )
+    # Outgoing request listing
+    op.create_index(
+        "ix_connection_requests_sender_status",
+        "connection_requests",
+        ["sender_id", "status"],
+    )
+
+    # ── user_connections ─────────────────────────────────────────────
+    op.create_table(
+        "user_connections",
+        sa.Column("id", sa.Integer, primary_key=True, index=True),
+        sa.Column(
+            "user_id",
+            sa.Integer,
+            sa.ForeignKey("users.id", ondelete="CASCADE"),
+            nullable=False,
+        ),
+        sa.Column(
+            "connected_user_id",
+            sa.Integer,
+            sa.ForeignKey("users.id", ondelete="CASCADE"),
+            nullable=False,
+        ),
+        sa.Column(
+            "person_id",
+            sa.Integer,
+            sa.ForeignKey("people.id", ondelete="SET NULL"),
+            nullable=True,
+        ),
+        sa.Column("sharing_overrides", JSONB, nullable=True),
+        sa.Column(
+            "created_at",
+            sa.DateTime,
+            nullable=False,
+            server_default=sa.func.now(),
+        ),
+        sa.UniqueConstraint("user_id", "connected_user_id", name="uq_user_connections"),
+    )
+
+
+def downgrade() -> None:
+    op.drop_table("user_connections")
+    op.drop_index("ix_connection_requests_sender_status", table_name="connection_requests")
+    op.drop_index("ix_connection_requests_receiver_status", table_name="connection_requests")
+    op.execute('DROP INDEX IF EXISTS "ix_connection_requests_pending"')
+    op.drop_table("connection_requests")

backend/alembic/versions/043_add_linked_fields_to_people.py

@@ -0,0 +1,44 @@
+"""Add linked_user_id and is_umbral_contact to people table.
+
+Revision ID: 043
+Revises: 042
+"""
+from alembic import op
+import sqlalchemy as sa
+
+revision = "043"
+down_revision = "042"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        "people",
+        sa.Column(
+            "linked_user_id",
+            sa.Integer,
+            sa.ForeignKey("users.id", ondelete="SET NULL"),
+            nullable=True,
+        ),
+    )
+    op.add_column(
+        "people",
+        sa.Column(
+            "is_umbral_contact",
+            sa.Boolean,
+            nullable=False,
+            server_default="false",
+        ),
+    )
+    # Fast lookup of umbral contacts by owner
+    op.execute(
+        'CREATE INDEX "ix_people_linked_user" ON people (user_id, linked_user_id) '
+        "WHERE linked_user_id IS NOT NULL"
+    )
+
+
+def downgrade() -> None:
+    op.execute('DROP INDEX IF EXISTS "ix_people_linked_user"')
+    op.drop_column("people", "is_umbral_contact")
+    op.drop_column("people", "linked_user_id")

backend/app/jobs/notifications.py

@@ -17,6 +17,7 @@ from sqlalchemy.orm import selectinload
 
 from app.database import AsyncSessionLocal
 from app.models.settings import Settings
+from app.models.notification import Notification as AppNotification
 from app.models.reminder import Reminder
 from app.models.calendar_event import CalendarEvent
 from app.models.calendar import Calendar
@@ -267,6 +268,13 @@ async def _purge_expired_sessions(db: AsyncSession) -> None:
     await db.commit()
 
 
+async def _purge_old_notifications(db: AsyncSession) -> None:
+    """Remove in-app notifications older than 90 days."""
+    cutoff = datetime.now() - timedelta(days=90)
+    await db.execute(delete(AppNotification).where(AppNotification.created_at < cutoff))
+    await db.commit()
+
+
 # ── Entry point ───────────────────────────────────────────────────────────────
 
 async def run_notification_dispatch() -> None:
@@ -308,6 +316,7 @@ async def run_notification_dispatch() -> None:
         async with AsyncSessionLocal() as db:
             await _purge_totp_usage(db)
             await _purge_expired_sessions(db)
+            await _purge_old_notifications(db)
 
     except Exception:
         # Broad catch: job failure must never crash the scheduler or the app

backend/app/main.py

@@ -7,7 +7,7 @@ from apscheduler.schedulers.asyncio import AsyncIOScheduler
 from app.config import settings
 from app.database import engine
 from app.routers import auth, todos, events, calendars, reminders, projects, people, locations, settings as settings_router, dashboard, weather, event_templates
-from app.routers import totp, admin
+from app.routers import totp, admin, notifications as notifications_router, connections as connections_router
 from app.jobs.notifications import run_notification_dispatch
 
 # Import models so Alembic's autogenerate can discover them
@@ -17,6 +17,9 @@ from app.models import totp_usage as _totp_usage_model  # noqa: F401
 from app.models import backup_code as _backup_code_model  # noqa: F401
 from app.models import system_config as _system_config_model  # noqa: F401
 from app.models import audit_log as _audit_log_model  # noqa: F401
+from app.models import notification as _notification_model  # noqa: F401
+from app.models import connection_request as _connection_request_model  # noqa: F401
+from app.models import user_connection as _user_connection_model  # noqa: F401
 
 
 # ---------------------------------------------------------------------------
@@ -129,6 +132,8 @@ app.include_router(weather.router, prefix="/api/weather", tags=["Weather"])
 app.include_router(event_templates.router, prefix="/api/event-templates", tags=["Event Templates"])
 app.include_router(totp.router, prefix="/api/auth", tags=["TOTP MFA"])
 app.include_router(admin.router, prefix="/api/admin", tags=["Admin"])
+app.include_router(notifications_router.router, prefix="/api/notifications", tags=["Notifications"])
+app.include_router(connections_router.router, prefix="/api/connections", tags=["Connections"])
 
 
 @app.get("/")

backend/app/models/__init__.py

@@ -15,6 +15,9 @@ from app.models.totp_usage import TOTPUsage
 from app.models.backup_code import BackupCode
 from app.models.system_config import SystemConfig
 from app.models.audit_log import AuditLog
+from app.models.notification import Notification
+from app.models.connection_request import ConnectionRequest
+from app.models.user_connection import UserConnection
 
 __all__ = [
     "Settings",
@@ -34,4 +37,7 @@ __all__ = [
     "BackupCode",
     "SystemConfig",
     "AuditLog",
+    "Notification",
+    "ConnectionRequest",
+    "UserConnection",
 ]

backend/app/models/connection_request.py

@@ -0,0 +1,33 @@
+from sqlalchemy import String, Integer, ForeignKey, CheckConstraint, func
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+from datetime import datetime
+from typing import Optional, TYPE_CHECKING
+from app.database import Base
+
+if TYPE_CHECKING:
+    from app.models.user import User
+
+
+class ConnectionRequest(Base):
+    __tablename__ = "connection_requests"
+    __table_args__ = (
+        CheckConstraint(
+            "status IN ('pending', 'accepted', 'rejected', 'cancelled')",
+            name="ck_connection_requests_status",
+        ),
+    )
+
+    id: Mapped[int] = mapped_column(primary_key=True, index=True)
+    sender_id: Mapped[int] = mapped_column(
+        Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False
+    )
+    receiver_id: Mapped[int] = mapped_column(
+        Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False
+    )
+    status: Mapped[str] = mapped_column(String(20), nullable=False, server_default="pending")
+    created_at: Mapped[datetime] = mapped_column(default=func.now(), server_default=func.now())
+    resolved_at: Mapped[Optional[datetime]] = mapped_column(nullable=True, default=None)
+
+    # Relationships with explicit foreign_keys to disambiguate
+    sender: Mapped["User"] = relationship(foreign_keys=[sender_id], lazy="selectin")
+    receiver: Mapped["User"] = relationship(foreign_keys=[receiver_id], lazy="selectin")

backend/app/models/notification.py

@@ -0,0 +1,23 @@
+from sqlalchemy import String, Text, Integer, Boolean, ForeignKey, func
+from sqlalchemy.dialects.postgresql import JSONB
+from sqlalchemy.orm import Mapped, mapped_column
+from datetime import datetime
+from typing import Optional
+from app.database import Base
+
+
+class Notification(Base):
+    __tablename__ = "notifications"
+
+    id: Mapped[int] = mapped_column(primary_key=True, index=True)
+    user_id: Mapped[int] = mapped_column(
+        Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False
+    )
+    type: Mapped[str] = mapped_column(String(50), nullable=False)
+    title: Mapped[Optional[str]] = mapped_column(String(255), nullable=True)
+    message: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
+    data: Mapped[Optional[dict]] = mapped_column(JSONB, nullable=True)
+    source_type: Mapped[Optional[str]] = mapped_column(String(50), nullable=True)
+    source_id: Mapped[Optional[int]] = mapped_column(Integer, nullable=True)
+    is_read: Mapped[bool] = mapped_column(Boolean, default=False, server_default="false")
+    created_at: Mapped[datetime] = mapped_column(default=func.now(), server_default=func.now())

backend/app/models/person.py

@@ -27,6 +27,11 @@ class Person(Base):
     job_title: Mapped[Optional[str]] = mapped_column(String(255), nullable=True)
     mobile: Mapped[Optional[str]] = mapped_column(String(50), nullable=True)
     category: Mapped[Optional[str]] = mapped_column(String(100), nullable=True)
+    # Umbral contact link
+    linked_user_id: Mapped[Optional[int]] = mapped_column(
+        Integer, ForeignKey("users.id", ondelete="SET NULL"), nullable=True
+    )
+    is_umbral_contact: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False, server_default=text('false'))
     created_at: Mapped[datetime] = mapped_column(default=func.now())
     updated_at: Mapped[datetime] = mapped_column(default=func.now(), onupdate=func.now())
 

backend/app/models/settings.py

@@ -1,4 +1,4 @@
-from sqlalchemy import String, Integer, Float, Boolean, ForeignKey, func
+from sqlalchemy import String, Text, Integer, Float, Boolean, ForeignKey, func
 from sqlalchemy.orm import Mapped, mapped_column
 from datetime import datetime
 from typing import Optional
@@ -46,6 +46,29 @@ class Settings(Base):
     auto_lock_enabled: Mapped[bool] = mapped_column(Boolean, default=False, server_default="false")
     auto_lock_minutes: Mapped[int] = mapped_column(Integer, default=5, server_default="5")
 
+    # Profile fields (shareable with connections)
+    phone: Mapped[Optional[str]] = mapped_column(String(50), nullable=True, default=None)
+    mobile: Mapped[Optional[str]] = mapped_column(String(50), nullable=True, default=None)
+    address: Mapped[Optional[str]] = mapped_column(Text, nullable=True, default=None)
+    company: Mapped[Optional[str]] = mapped_column(String(255), nullable=True, default=None)
+    job_title: Mapped[Optional[str]] = mapped_column(String(255), nullable=True, default=None)
+
+    # Social settings
+    accept_connections: Mapped[bool] = mapped_column(Boolean, default=False, server_default="false")
+
+    # Sharing defaults (what fields are shared with connections by default)
+    share_preferred_name: Mapped[bool] = mapped_column(Boolean, default=True, server_default="true")
+    share_email: Mapped[bool] = mapped_column(Boolean, default=False, server_default="false")
+    share_phone: Mapped[bool] = mapped_column(Boolean, default=False, server_default="false")
+    share_mobile: Mapped[bool] = mapped_column(Boolean, default=False, server_default="false")
+    share_birthday: Mapped[bool] = mapped_column(Boolean, default=False, server_default="false")
+    share_address: Mapped[bool] = mapped_column(Boolean, default=False, server_default="false")
+    share_company: Mapped[bool] = mapped_column(Boolean, default=False, server_default="false")
+    share_job_title: Mapped[bool] = mapped_column(Boolean, default=False, server_default="false")
+
+    # ntfy connection notification toggle (gates push only, not in-app)
+    ntfy_connections_enabled: Mapped[bool] = mapped_column(Boolean, default=True, server_default="true")
+
     @property
     def ntfy_has_token(self) -> bool:
         """Derived field for SettingsResponse — True when an auth token is stored."""

backend/app/models/user.py

@@ -9,6 +9,7 @@ class User(Base):
 
     id: Mapped[int] = mapped_column(primary_key=True, index=True)
     username: Mapped[str] = mapped_column(String(50), unique=True, nullable=False, index=True)
+    umbral_name: Mapped[str] = mapped_column(String(50), unique=True, index=True)
     email: Mapped[str | None] = mapped_column(String(255), nullable=True)
     first_name: Mapped[str | None] = mapped_column(String(100), nullable=True)
     last_name: Mapped[str | None] = mapped_column(String(100), nullable=True)

backend/app/models/user_connection.py

@@ -0,0 +1,31 @@
+from sqlalchemy import Integer, ForeignKey, func
+from sqlalchemy.dialects.postgresql import JSONB
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+from datetime import datetime
+from typing import Optional, TYPE_CHECKING
+from app.database import Base
+
+if TYPE_CHECKING:
+    from app.models.user import User
+    from app.models.person import Person
+
+
+class UserConnection(Base):
+    __tablename__ = "user_connections"
+
+    id: Mapped[int] = mapped_column(primary_key=True, index=True)
+    user_id: Mapped[int] = mapped_column(
+        Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False
+    )
+    connected_user_id: Mapped[int] = mapped_column(
+        Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False
+    )
+    person_id: Mapped[Optional[int]] = mapped_column(
+        Integer, ForeignKey("people.id", ondelete="SET NULL"), nullable=True
+    )
+    sharing_overrides: Mapped[Optional[dict]] = mapped_column(JSONB, nullable=True)
+    created_at: Mapped[datetime] = mapped_column(default=func.now(), server_default=func.now())
+
+    # Relationships
+    connected_user: Mapped["User"] = relationship(foreign_keys=[connected_user_id], lazy="selectin")
+    person: Mapped[Optional["Person"]] = relationship(foreign_keys=[person_id], lazy="selectin")

backend/app/routers/connections.py

@@ -0,0 +1,642 @@
+"""
+Connection router — search, request, respond, manage connections.
+
+Security:
+- Timing-safe search (50ms sleep floor)
+- Per-receiver pending request cap (5 within 10 minutes)
+- Atomic accept via UPDATE...WHERE status='pending' RETURNING *
+- All endpoints scoped by current_user.id
+- Audit logging for all connection events
+"""
+import asyncio
+from datetime import datetime, timedelta, timezone
+
+from fastapi import APIRouter, BackgroundTasks, Depends, HTTPException, Path, Query, Request
+from sqlalchemy import select, func, and_, update
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy.orm import selectinload
+
+from app.database import get_db
+from app.models.connection_request import ConnectionRequest
+from app.models.notification import Notification
+from app.models.person import Person
+from app.models.settings import Settings
+from app.models.user import User
+from app.models.user_connection import UserConnection
+from app.routers.auth import get_current_user
+from app.schemas.connection import (
+    ConnectionRequestResponse,
+    ConnectionResponse,
+    RespondRequest,
+    SendConnectionRequest,
+    SharingOverrideUpdate,
+    UmbralSearchRequest,
+    UmbralSearchResponse,
+)
+from app.services.audit import get_client_ip, log_audit_event
+from app.services.connection import (
+    SHAREABLE_FIELDS,
+    create_person_from_connection,
+    detach_umbral_contact,
+    resolve_shared_profile,
+    send_connection_ntfy,
+)
+from app.services.notification import create_notification
+
+router = APIRouter()
+
+
+# ── Helpers ──────────────────────────────────────────────────────────
+
+async def _get_settings_for_user(db: AsyncSession, user_id: int) -> Settings | None:
+    result = await db.execute(select(Settings).where(Settings.user_id == user_id))
+    return result.scalar_one_or_none()
+
+
+def _build_request_response(
+    req: ConnectionRequest,
+    sender: User,
+    sender_settings: Settings | None,
+    receiver: User,
+    receiver_settings: Settings | None,
+) -> ConnectionRequestResponse:
+    return ConnectionRequestResponse(
+        id=req.id,
+        sender_umbral_name=sender.umbral_name,
+        sender_preferred_name=sender_settings.preferred_name if sender_settings else None,
+        receiver_umbral_name=receiver.umbral_name,
+        receiver_preferred_name=receiver_settings.preferred_name if receiver_settings else None,
+        status=req.status,
+        created_at=req.created_at,
+    )
+
+
+# ── POST /search ────────────────────────────────────────────────────
+
+@router.post("/search", response_model=UmbralSearchResponse)
+async def search_user(
+    body: UmbralSearchRequest,
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """
+    Timing-safe user search. Always queries by umbral_name alone,
+    then checks accept_connections + is_active in Python.
+    Generic "not found" for non-existent, opted-out, AND inactive users.
+    50ms sleep floor to eliminate timing side-channel.
+    """
+    # Always sleep to prevent timing attacks
+    await asyncio.sleep(0.05)
+
+    # Don't find yourself
+    if body.umbral_name == current_user.umbral_name:
+        return UmbralSearchResponse(found=False)
+
+    result = await db.execute(
+        select(User).where(User.umbral_name == body.umbral_name)
+    )
+    target = result.scalar_one_or_none()
+
+    if not target or not target.is_active:
+        return UmbralSearchResponse(found=False)
+
+    # Check if they accept connections
+    target_settings = await _get_settings_for_user(db, target.id)
+    if not target_settings or not target_settings.accept_connections:
+        return UmbralSearchResponse(found=False)
+
+    return UmbralSearchResponse(found=True)
+
+
+# ── POST /request ───────────────────────────────────────────────────
+
+@router.post("/request", response_model=ConnectionRequestResponse, status_code=201)
+async def send_connection_request(
+    body: SendConnectionRequest,
+    request: Request,
+    background_tasks: BackgroundTasks,
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """Send a connection request to another user."""
+    # Resolve target
+    result = await db.execute(
+        select(User).where(User.umbral_name == body.umbral_name)
+    )
+    target = result.scalar_one_or_none()
+
+    if not target or not target.is_active:
+        raise HTTPException(status_code=404, detail="User not found")
+
+    # Self-request guard
+    if target.id == current_user.id:
+        raise HTTPException(status_code=400, detail="Cannot send a connection request to yourself")
+
+    # Check accept_connections
+    target_settings = await _get_settings_for_user(db, target.id)
+    if not target_settings or not target_settings.accept_connections:
+        raise HTTPException(status_code=404, detail="User not found")
+
+    # Check existing connection
+    existing_conn = await db.execute(
+        select(UserConnection).where(
+            UserConnection.user_id == current_user.id,
+            UserConnection.connected_user_id == target.id,
+        )
+    )
+    if existing_conn.scalar_one_or_none():
+        raise HTTPException(status_code=409, detail="Already connected")
+
+    # Check pending request in either direction
+    existing_req = await db.execute(
+        select(ConnectionRequest).where(
+            and_(
+                ConnectionRequest.status == "pending",
+                (
+                    (ConnectionRequest.sender_id == current_user.id) & (ConnectionRequest.receiver_id == target.id)
+                ) | (
+                    (ConnectionRequest.sender_id == target.id) & (ConnectionRequest.receiver_id == current_user.id)
+                ),
+            )
+        )
+    )
+    if existing_req.scalar_one_or_none():
+        raise HTTPException(status_code=409, detail="A pending request already exists")
+
+    # Per-receiver cap: max 5 pending requests within 10 minutes
+    ten_min_ago = datetime.now() - timedelta(minutes=10)
+    pending_count = await db.scalar(
+        select(func.count())
+        .select_from(ConnectionRequest)
+        .where(
+            ConnectionRequest.receiver_id == target.id,
+            ConnectionRequest.status == "pending",
+            ConnectionRequest.created_at >= ten_min_ago,
+        )
+    ) or 0
+    if pending_count >= 5:
+        raise HTTPException(status_code=429, detail="Too many pending requests for this user")
+
+    # Create the request
+    conn_request = ConnectionRequest(
+        sender_id=current_user.id,
+        receiver_id=target.id,
+    )
+    db.add(conn_request)
+
+    # Create in-app notification for receiver
+    sender_settings = await _get_settings_for_user(db, current_user.id)
+    sender_display = (sender_settings.preferred_name if sender_settings else None) or current_user.umbral_name
+
+    await create_notification(
+        db,
+        user_id=target.id,
+        type="connection_request",
+        title="New Connection Request",
+        message=f"{sender_display} wants to connect with you",
+        data={"sender_umbral_name": current_user.umbral_name},
+        source_type="connection_request",
+        source_id=None,  # Will be set after flush
+    )
+
+    await log_audit_event(
+        db,
+        action="connection.request_sent",
+        actor_id=current_user.id,
+        target_id=target.id,
+        detail={"receiver_umbral_name": target.umbral_name},
+        ip=get_client_ip(request),
+    )
+
+    await db.commit()
+    await db.refresh(conn_request)
+
+    # ntfy push in background (non-blocking)
+    background_tasks.add_task(
+        send_connection_ntfy,
+        target_settings,
+        sender_display,
+        "request_received",
+    )
+
+    return _build_request_response(conn_request, current_user, sender_settings, target, target_settings)
+
+
+# ── GET /requests/incoming ──────────────────────────────────────────
+
+@router.get("/requests/incoming", response_model=list[ConnectionRequestResponse])
+async def get_incoming_requests(
+    page: int = Query(1, ge=1),
+    per_page: int = Query(20, ge=1, le=100),
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """List pending connection requests received by the current user."""
+    offset = (page - 1) * per_page
+    result = await db.execute(
+        select(ConnectionRequest)
+        .where(
+            ConnectionRequest.receiver_id == current_user.id,
+            ConnectionRequest.status == "pending",
+        )
+        .options(selectinload(ConnectionRequest.sender))
+        .order_by(ConnectionRequest.created_at.desc())
+        .offset(offset)
+        .limit(per_page)
+    )
+    requests = result.scalars().all()
+
+    responses = []
+    for req in requests:
+        sender_settings = await _get_settings_for_user(db, req.sender_id)
+        receiver_settings = await _get_settings_for_user(db, current_user.id)
+        responses.append(_build_request_response(req, req.sender, sender_settings, current_user, receiver_settings))
+
+    return responses
+
+
+# ── GET /requests/outgoing ──────────────────────────────────────────
+
+@router.get("/requests/outgoing", response_model=list[ConnectionRequestResponse])
+async def get_outgoing_requests(
+    page: int = Query(1, ge=1),
+    per_page: int = Query(20, ge=1, le=100),
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """List pending connection requests sent by the current user."""
+    offset = (page - 1) * per_page
+    result = await db.execute(
+        select(ConnectionRequest)
+        .where(
+            ConnectionRequest.sender_id == current_user.id,
+            ConnectionRequest.status == "pending",
+        )
+        .options(selectinload(ConnectionRequest.receiver))
+        .order_by(ConnectionRequest.created_at.desc())
+        .offset(offset)
+        .limit(per_page)
+    )
+    requests = result.scalars().all()
+
+    responses = []
+    for req in requests:
+        sender_settings = await _get_settings_for_user(db, current_user.id)
+        receiver_settings = await _get_settings_for_user(db, req.receiver_id)
+        responses.append(_build_request_response(req, current_user, sender_settings, req.receiver, receiver_settings))
+
+    return responses
+
+
+# ── PUT /requests/{id}/respond ──────────────────────────────────────
+
+@router.put("/requests/{request_id}/respond")
+async def respond_to_request(
+    body: RespondRequest,
+    request: Request,
+    background_tasks: BackgroundTasks,
+    request_id: int = Path(ge=1, le=2147483647),
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """Accept or reject a connection request. Atomic via UPDATE...WHERE status='pending'."""
+    now = datetime.now()
+
+    # Atomic update — only succeeds if status is still 'pending' and receiver is current user
+    result = await db.execute(
+        update(ConnectionRequest)
+        .where(
+            ConnectionRequest.id == request_id,
+            ConnectionRequest.receiver_id == current_user.id,
+            ConnectionRequest.status == "pending",
+        )
+        .values(status=body.action + "ed", resolved_at=now)
+        .returning(ConnectionRequest.id, ConnectionRequest.sender_id, ConnectionRequest.receiver_id)
+    )
+    row = result.first()
+    if not row:
+        raise HTTPException(status_code=409, detail="Request not found or already resolved")
+
+    sender_id = row.sender_id
+
+    if body.action == "accept":
+        # Verify sender is still active
+        sender_result = await db.execute(select(User).where(User.id == sender_id))
+        sender = sender_result.scalar_one_or_none()
+        if not sender or not sender.is_active:
+            # Revert to rejected
+            await db.execute(
+                update(ConnectionRequest)
+                .where(ConnectionRequest.id == request_id)
+                .values(status="rejected")
+            )
+            await db.commit()
+            raise HTTPException(status_code=409, detail="Sender account is no longer active")
+
+        # Get settings for both users
+        sender_settings = await _get_settings_for_user(db, sender_id)
+        receiver_settings = await _get_settings_for_user(db, current_user.id)
+
+        # Resolve shared profiles for both directions
+        sender_shared = resolve_shared_profile(sender, sender_settings, None) if sender_settings else {}
+        receiver_shared = resolve_shared_profile(current_user, receiver_settings, None) if receiver_settings else {}
+
+        # Create Person records for both users
+        person_for_receiver = create_person_from_connection(
+            current_user.id, sender, sender_settings, sender_shared
+        )
+        person_for_sender = create_person_from_connection(
+            sender_id, current_user, receiver_settings, receiver_shared
+        )
+        db.add(person_for_receiver)
+        db.add(person_for_sender)
+        await db.flush()  # populate person IDs
+
+        # Create bidirectional connections
+        conn_a = UserConnection(
+            user_id=current_user.id,
+            connected_user_id=sender_id,
+            person_id=person_for_receiver.id,
+        )
+        conn_b = UserConnection(
+            user_id=sender_id,
+            connected_user_id=current_user.id,
+            person_id=person_for_sender.id,
+        )
+        db.add(conn_a)
+        db.add(conn_b)
+
+        # Notification to sender
+        receiver_display = (receiver_settings.preferred_name if receiver_settings else None) or current_user.umbral_name
+        await create_notification(
+            db,
+            user_id=sender_id,
+            type="connection_accepted",
+            title="Connection Accepted",
+            message=f"{receiver_display} accepted your connection request",
+            data={"connected_umbral_name": current_user.umbral_name},
+            source_type="user_connection",
+            source_id=None,
+        )
+
+        await log_audit_event(
+            db,
+            action="connection.accepted",
+            actor_id=current_user.id,
+            target_id=sender_id,
+            detail={"request_id": request_id},
+            ip=get_client_ip(request),
+        )
+
+        await db.commit()
+
+        # ntfy push in background
+        if sender_settings:
+            background_tasks.add_task(
+                send_connection_ntfy,
+                sender_settings,
+                receiver_display,
+                "request_accepted",
+            )
+
+        return {"message": "Connection accepted", "connection_id": conn_a.id}
+
+    else:
+        # Reject — only create notification for receiver (not sender per plan)
+        await log_audit_event(
+            db,
+            action="connection.rejected",
+            actor_id=current_user.id,
+            target_id=sender_id,
+            detail={"request_id": request_id},
+            ip=get_client_ip(request),
+        )
+        await db.commit()
+        return {"message": "Connection request rejected"}
+
+
+# ── GET / ───────────────────────────────────────────────────────────
+
+@router.get("/", response_model=list[ConnectionResponse])
+async def list_connections(
+    page: int = Query(1, ge=1),
+    per_page: int = Query(50, ge=1, le=100),
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """List all connections for the current user."""
+    offset = (page - 1) * per_page
+    result = await db.execute(
+        select(UserConnection)
+        .where(UserConnection.user_id == current_user.id)
+        .options(selectinload(UserConnection.connected_user))
+        .order_by(UserConnection.created_at.desc())
+        .offset(offset)
+        .limit(per_page)
+    )
+    connections = result.scalars().all()
+
+    responses = []
+    for conn in connections:
+        conn_settings = await _get_settings_for_user(db, conn.connected_user_id)
+        responses.append(ConnectionResponse(
+            id=conn.id,
+            connected_user_id=conn.connected_user_id,
+            connected_umbral_name=conn.connected_user.umbral_name,
+            connected_preferred_name=conn_settings.preferred_name if conn_settings else None,
+            person_id=conn.person_id,
+            created_at=conn.created_at,
+        ))
+
+    return responses
+
+
+# ── GET /{id} ───────────────────────────────────────────────────────
+
+@router.get("/{connection_id}", response_model=ConnectionResponse)
+async def get_connection(
+    connection_id: int = Path(ge=1, le=2147483647),
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """Get a single connection detail."""
+    result = await db.execute(
+        select(UserConnection)
+        .where(
+            UserConnection.id == connection_id,
+            UserConnection.user_id == current_user.id,
+        )
+        .options(selectinload(UserConnection.connected_user))
+    )
+    conn = result.scalar_one_or_none()
+    if not conn:
+        raise HTTPException(status_code=404, detail="Connection not found")
+
+    conn_settings = await _get_settings_for_user(db, conn.connected_user_id)
+    return ConnectionResponse(
+        id=conn.id,
+        connected_user_id=conn.connected_user_id,
+        connected_umbral_name=conn.connected_user.umbral_name,
+        connected_preferred_name=conn_settings.preferred_name if conn_settings else None,
+        person_id=conn.person_id,
+        created_at=conn.created_at,
+    )
+
+
+# ── GET /{id}/shared-profile ────────────────────────────────────────
+
+@router.get("/{connection_id}/shared-profile")
+async def get_shared_profile(
+    connection_id: int = Path(ge=1, le=2147483647),
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """Get the resolved shared profile for a connection."""
+    result = await db.execute(
+        select(UserConnection)
+        .where(
+            UserConnection.id == connection_id,
+            UserConnection.user_id == current_user.id,
+        )
+        .options(selectinload(UserConnection.connected_user))
+    )
+    conn = result.scalar_one_or_none()
+    if not conn:
+        raise HTTPException(status_code=404, detail="Connection not found")
+
+    conn_settings = await _get_settings_for_user(db, conn.connected_user_id)
+    if not conn_settings:
+        return {}
+
+    return resolve_shared_profile(
+        conn.connected_user,
+        conn_settings,
+        conn.sharing_overrides,
+    )
+
+
+# ── PUT /{id}/sharing-overrides ─────────────────────────────────────
+
+@router.put("/{connection_id}/sharing-overrides")
+async def update_sharing_overrides(
+    body: SharingOverrideUpdate,
+    connection_id: int = Path(ge=1, le=2147483647),
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """Update what YOU share with a specific connection."""
+    # Find the connection where the OTHER user connects to YOU
+    result = await db.execute(
+        select(UserConnection).where(
+            UserConnection.connected_user_id == current_user.id,
+            UserConnection.user_id != current_user.id,
+        )
+    )
+    # We need the reverse connection (where we are the connected_user)
+    # Actually, we need to find the connection from the counterpart's perspective
+    # The connection_id is OUR connection. The sharing overrides go on the
+    # counterpart's connection row (since they determine what they see from us).
+    # Wait — per the plan, sharing overrides control what WE share with THEM.
+    # So they go on their connection row pointing to us.
+
+    # First, get our connection to know who the counterpart is
+    our_conn = await db.execute(
+        select(UserConnection).where(
+            UserConnection.id == connection_id,
+            UserConnection.user_id == current_user.id,
+        )
+    )
+    conn = our_conn.scalar_one_or_none()
+    if not conn:
+        raise HTTPException(status_code=404, detail="Connection not found")
+
+    # Find the reverse connection (their row pointing to us)
+    reverse_result = await db.execute(
+        select(UserConnection).where(
+            UserConnection.user_id == conn.connected_user_id,
+            UserConnection.connected_user_id == current_user.id,
+        )
+    )
+    reverse_conn = reverse_result.scalar_one_or_none()
+    if not reverse_conn:
+        raise HTTPException(status_code=404, detail="Reverse connection not found")
+
+    # Build validated overrides dict — only SHAREABLE_FIELDS keys
+    overrides = {}
+    update_data = body.model_dump(exclude_unset=True)
+    for key, value in update_data.items():
+        if key in SHAREABLE_FIELDS:
+            overrides[key] = value
+
+    reverse_conn.sharing_overrides = overrides if overrides else None
+
+    await db.commit()
+    return {"message": "Sharing overrides updated"}
+
+
+# ── DELETE /{id} ────────────────────────────────────────────────────
+
+@router.delete("/{connection_id}", status_code=204)
+async def remove_connection(
+    request: Request,
+    connection_id: int = Path(ge=1, le=2147483647),
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """
+    Remove a connection. Removes BOTH UserConnection rows.
+    Detaches BOTH Person records (sets linked_user_id=null, is_umbral_contact=false).
+    Silent — no notification sent.
+    """
+    # Get our connection
+    result = await db.execute(
+        select(UserConnection)
+        .where(
+            UserConnection.id == connection_id,
+            UserConnection.user_id == current_user.id,
+        )
+    )
+    conn = result.scalar_one_or_none()
+    if not conn:
+        raise HTTPException(status_code=404, detail="Connection not found")
+
+    counterpart_id = conn.connected_user_id
+
+    # Find reverse connection
+    reverse_result = await db.execute(
+        select(UserConnection).where(
+            UserConnection.user_id == counterpart_id,
+            UserConnection.connected_user_id == current_user.id,
+        )
+    )
+    reverse_conn = reverse_result.scalar_one_or_none()
+
+    # Detach Person records
+    if conn.person_id:
+        person_result = await db.execute(select(Person).where(Person.id == conn.person_id))
+        person = person_result.scalar_one_or_none()
+        if person:
+            await detach_umbral_contact(person)
+
+    if reverse_conn and reverse_conn.person_id:
+        person_result = await db.execute(select(Person).where(Person.id == reverse_conn.person_id))
+        person = person_result.scalar_one_or_none()
+        if person:
+            await detach_umbral_contact(person)
+
+    # Delete both connections
+    await db.delete(conn)
+    if reverse_conn:
+        await db.delete(reverse_conn)
+
+    await log_audit_event(
+        db,
+        action="connection.removed",
+        actor_id=current_user.id,
+        target_id=counterpart_id,
+        detail={"connection_id": connection_id},
+        ip=get_client_ip(request),
+    )
+
+    await db.commit()
+    return None

backend/app/routers/notifications.py

@@ -0,0 +1,143 @@
+"""
+Notification centre router — in-app notifications.
+
+All endpoints scoped by current_user.id to prevent IDOR.
+"""
+from fastapi import APIRouter, Depends, HTTPException, Path, Query
+from sqlalchemy import select, func, update, delete, and_
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.database import get_db
+from app.models.notification import Notification
+from app.models.user import User
+from app.routers.auth import get_current_user
+from app.schemas.notification import (
+    NotificationResponse,
+    NotificationListResponse,
+    MarkReadRequest,
+)
+
+router = APIRouter()
+
+
+@router.get("/", response_model=NotificationListResponse)
+async def list_notifications(
+    unread_only: bool = Query(False),
+    type: str | None = Query(None, max_length=50),
+    page: int = Query(1, ge=1),
+    per_page: int = Query(20, ge=1, le=100),
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """Paginated notification list with optional filters."""
+    base = select(Notification).where(Notification.user_id == current_user.id)
+
+    if unread_only:
+        base = base.where(Notification.is_read == False)  # noqa: E712
+    if type:
+        base = base.where(Notification.type == type)
+
+    # Total count
+    count_q = select(func.count()).select_from(base.subquery())
+    total = await db.scalar(count_q) or 0
+
+    # Unread count (always full, regardless of filters)
+    unread_count = await db.scalar(
+        select(func.count())
+        .select_from(Notification)
+        .where(
+            Notification.user_id == current_user.id,
+            Notification.is_read == False,  # noqa: E712
+        )
+    ) or 0
+
+    # Paginated results
+    offset = (page - 1) * per_page
+    result = await db.execute(
+        base.order_by(Notification.created_at.desc()).offset(offset).limit(per_page)
+    )
+    notifications = result.scalars().all()
+
+    return NotificationListResponse(
+        notifications=notifications,
+        unread_count=unread_count,
+        total=total,
+    )
+
+
+@router.get("/unread-count")
+async def get_unread_count(
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """Lightweight unread count endpoint (uses partial index)."""
+    count = await db.scalar(
+        select(func.count())
+        .select_from(Notification)
+        .where(
+            Notification.user_id == current_user.id,
+            Notification.is_read == False,  # noqa: E712
+        )
+    ) or 0
+    return {"count": count}
+
+
+@router.put("/read")
+async def mark_read(
+    body: MarkReadRequest,
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """Mark specific notification IDs as read (user_id scoped — IDOR prevention)."""
+    await db.execute(
+        update(Notification)
+        .where(
+            and_(
+                Notification.id.in_(body.notification_ids),
+                Notification.user_id == current_user.id,
+            )
+        )
+        .values(is_read=True)
+    )
+    await db.commit()
+    return {"message": "Notifications marked as read"}
+
+
+@router.put("/read-all")
+async def mark_all_read(
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """Mark all notifications as read for current user."""
+    await db.execute(
+        update(Notification)
+        .where(
+            Notification.user_id == current_user.id,
+            Notification.is_read == False,  # noqa: E712
+        )
+        .values(is_read=True)
+    )
+    await db.commit()
+    return {"message": "All notifications marked as read"}
+
+
+@router.delete("/{notification_id}", status_code=204)
+async def delete_notification(
+    notification_id: int = Path(ge=1, le=2147483647),
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """Delete a single notification (user_id scoped)."""
+    result = await db.execute(
+        select(Notification).where(
+            Notification.id == notification_id,
+            Notification.user_id == current_user.id,
+        )
+    )
+    notification = result.scalar_one_or_none()
+    if not notification:
+        raise HTTPException(status_code=404, detail="Notification not found")
+
+    await db.delete(notification)
+    await db.commit()
+    return None

backend/app/routers/people.py

@@ -1,14 +1,18 @@
 from fastapi import APIRouter, Depends, HTTPException, Path, Query
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy import select, or_
+from sqlalchemy.orm import selectinload
 from datetime import datetime, timezone
 from typing import Optional, List
 
 from app.database import get_db
 from app.models.person import Person
+from app.models.settings import Settings
+from app.models.user import User
+from app.models.user_connection import UserConnection
 from app.schemas.person import PersonCreate, PersonUpdate, PersonResponse
 from app.routers.auth import get_current_user
-from app.models.user import User
+from app.services.connection import resolve_shared_profile
 
 router = APIRouter()
 
@@ -59,6 +63,53 @@ async def get_people(
     result = await db.execute(query)
     people = result.scalars().all()
 
+    # Batch-load shared profiles for umbral contacts
+    umbral_people = [p for p in people if p.linked_user_id is not None]
+    if umbral_people:
+        linked_user_ids = [p.linked_user_id for p in umbral_people]
+
+        # Batch fetch users and settings
+        users_result = await db.execute(
+            select(User).where(User.id.in_(linked_user_ids))
+        )
+        users_by_id = {u.id: u for u in users_result.scalars().all()}
+
+        settings_result = await db.execute(
+            select(Settings).where(Settings.user_id.in_(linked_user_ids))
+        )
+        settings_by_user = {s.user_id: s for s in settings_result.scalars().all()}
+
+        # Batch fetch connection overrides
+        conns_result = await db.execute(
+            select(UserConnection).where(
+                UserConnection.user_id == current_user.id,
+                UserConnection.connected_user_id.in_(linked_user_ids),
+            )
+        )
+        overrides_by_user = {
+            c.connected_user_id: c.sharing_overrides
+            for c in conns_result.scalars().all()
+        }
+
+        # Build shared profiles
+        shared_profiles: dict[int, dict] = {}
+        for uid in linked_user_ids:
+            user = users_by_id.get(uid)
+            user_settings = settings_by_user.get(uid)
+            if user and user_settings:
+                shared_profiles[uid] = resolve_shared_profile(
+                    user, user_settings, overrides_by_user.get(uid)
+                )
+
+        # Attach to response
+        responses = []
+        for p in people:
+            resp = PersonResponse.model_validate(p)
+            if p.linked_user_id and p.linked_user_id in shared_profiles:
+                resp.shared_fields = shared_profiles[p.linked_user_id]
+            responses.append(resp)
+        return responses
+
     return people
 
 
@@ -104,7 +155,28 @@ async def get_person(
     if not person:
         raise HTTPException(status_code=404, detail="Person not found")
 
-    return person
+    resp = PersonResponse.model_validate(person)
+    if person.linked_user_id:
+        linked_user_result = await db.execute(
+            select(User).where(User.id == person.linked_user_id)
+        )
+        linked_user = linked_user_result.scalar_one_or_none()
+        linked_settings_result = await db.execute(
+            select(Settings).where(Settings.user_id == person.linked_user_id)
+        )
+        linked_settings = linked_settings_result.scalar_one_or_none()
+        conn_result = await db.execute(
+            select(UserConnection).where(
+                UserConnection.user_id == current_user.id,
+                UserConnection.connected_user_id == person.linked_user_id,
+            )
+        )
+        conn = conn_result.scalar_one_or_none()
+        if linked_user and linked_settings:
+            resp.shared_fields = resolve_shared_profile(
+                linked_user, linked_settings, conn.sharing_overrides if conn else None
+            )
+    return resp
 
 
 @router.put("/{person_id}", response_model=PersonResponse)

backend/app/routers/settings.py

@@ -39,6 +39,25 @@ def _to_settings_response(s: Settings) -> SettingsResponse:
         ntfy_has_token=bool(s.ntfy_auth_token),  # derived — never expose the token value
         auto_lock_enabled=s.auto_lock_enabled,
         auto_lock_minutes=s.auto_lock_minutes,
+        # Profile fields
+        phone=s.phone,
+        mobile=s.mobile,
+        address=s.address,
+        company=s.company,
+        job_title=s.job_title,
+        # Social settings
+        accept_connections=s.accept_connections,
+        # Sharing defaults
+        share_preferred_name=s.share_preferred_name,
+        share_email=s.share_email,
+        share_phone=s.share_phone,
+        share_mobile=s.share_mobile,
+        share_birthday=s.share_birthday,
+        share_address=s.share_address,
+        share_company=s.share_company,
+        share_job_title=s.share_job_title,
+        # ntfy connections toggle
+        ntfy_connections_enabled=s.ntfy_connections_enabled,
         created_at=s.created_at,
         updated_at=s.updated_at,
     )

backend/app/schemas/admin.py

@@ -20,6 +20,7 @@ from app.schemas.auth import _validate_username, _validate_password_strength, _v
 class UserListItem(BaseModel):
     id: int
     username: str
+    umbral_name: str = ""
     email: Optional[str] = None
     first_name: Optional[str] = None
     last_name: Optional[str] = None

backend/app/schemas/connection.py

@@ -0,0 +1,75 @@
+"""
+Connection schemas — search, request, respond, connection management.
+All input schemas use extra="forbid" to prevent mass-assignment.
+"""
+import re
+from typing import Literal, Optional
+from datetime import datetime
+
+from pydantic import BaseModel, ConfigDict, Field, field_validator
+
+_UMBRAL_NAME_RE = re.compile(r'^[a-zA-Z0-9_-]{3,50}$')
+
+
+class UmbralSearchRequest(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+    umbral_name: str = Field(..., max_length=50)
+
+    @field_validator('umbral_name')
+    @classmethod
+    def validate_umbral_name(cls, v: str) -> str:
+        if not _UMBRAL_NAME_RE.match(v):
+            raise ValueError('Umbral name must be 3-50 alphanumeric characters, hyphens, or underscores')
+        return v
+
+
+class UmbralSearchResponse(BaseModel):
+    found: bool
+
+
+class SendConnectionRequest(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+    umbral_name: str = Field(..., max_length=50)
+
+    @field_validator('umbral_name')
+    @classmethod
+    def validate_umbral_name(cls, v: str) -> str:
+        if not _UMBRAL_NAME_RE.match(v):
+            raise ValueError('Umbral name must be 3-50 alphanumeric characters, hyphens, or underscores')
+        return v
+
+
+class ConnectionRequestResponse(BaseModel):
+    id: int
+    sender_umbral_name: str
+    sender_preferred_name: Optional[str] = None
+    receiver_umbral_name: str
+    receiver_preferred_name: Optional[str] = None
+    status: str
+    created_at: datetime
+
+
+class RespondRequest(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+    action: Literal["accept", "reject"]
+
+
+class ConnectionResponse(BaseModel):
+    id: int
+    connected_user_id: int
+    connected_umbral_name: str
+    connected_preferred_name: Optional[str] = None
+    person_id: Optional[int] = None
+    created_at: datetime
+
+
+class SharingOverrideUpdate(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+    preferred_name: Optional[bool] = None
+    email: Optional[bool] = None
+    phone: Optional[bool] = None
+    mobile: Optional[bool] = None
+    birthday: Optional[bool] = None
+    address: Optional[bool] = None
+    company: Optional[bool] = None
+    job_title: Optional[bool] = None

backend/app/schemas/notification.py

@@ -0,0 +1,30 @@
+from pydantic import BaseModel, ConfigDict, Field
+from datetime import datetime
+from typing import Optional
+
+
+class NotificationResponse(BaseModel):
+    id: int
+    user_id: int
+    type: str
+    title: Optional[str] = None
+    message: Optional[str] = None
+    data: Optional[dict] = None
+    source_type: Optional[str] = None
+    source_id: Optional[int] = None
+    is_read: bool
+    created_at: datetime
+
+    model_config = ConfigDict(from_attributes=True)
+
+
+class NotificationListResponse(BaseModel):
+    notifications: list[NotificationResponse]
+    unread_count: int
+    total: int
+
+
+class MarkReadRequest(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+
+    notification_ids: list[int] = Field(..., min_length=1, max_length=100)

backend/app/schemas/person.py

@@ -85,6 +85,9 @@ class PersonResponse(BaseModel):
     company: Optional[str]
     job_title: Optional[str]
     notes: Optional[str]
+    linked_user_id: Optional[int] = None
+    is_umbral_contact: bool = False
+    shared_fields: Optional[dict] = None
     created_at: datetime
     updated_at: datetime
 

backend/app/schemas/settings.py

@@ -37,6 +37,29 @@ class SettingsUpdate(BaseModel):
     auto_lock_enabled: Optional[bool] = None
     auto_lock_minutes: Optional[int] = None
 
+    # Profile fields (shareable with connections)
+    phone: Optional[str] = Field(None, max_length=50)
+    mobile: Optional[str] = Field(None, max_length=50)
+    address: Optional[str] = Field(None, max_length=2000)
+    company: Optional[str] = Field(None, max_length=255)
+    job_title: Optional[str] = Field(None, max_length=255)
+
+    # Social settings
+    accept_connections: Optional[bool] = None
+
+    # Sharing defaults
+    share_preferred_name: Optional[bool] = None
+    share_email: Optional[bool] = None
+    share_phone: Optional[bool] = None
+    share_mobile: Optional[bool] = None
+    share_birthday: Optional[bool] = None
+    share_address: Optional[bool] = None
+    share_company: Optional[bool] = None
+    share_job_title: Optional[bool] = None
+
+    # ntfy connections toggle
+    ntfy_connections_enabled: Optional[bool] = None
+
     @field_validator('auto_lock_minutes')
     @classmethod
     def validate_auto_lock_minutes(cls, v: Optional[int]) -> Optional[int]:
@@ -151,6 +174,29 @@ class SettingsResponse(BaseModel):
     auto_lock_enabled: bool = False
     auto_lock_minutes: int = 5
 
+    # Profile fields
+    phone: Optional[str] = None
+    mobile: Optional[str] = None
+    address: Optional[str] = None
+    company: Optional[str] = None
+    job_title: Optional[str] = None
+
+    # Social settings
+    accept_connections: bool = False
+
+    # Sharing defaults
+    share_preferred_name: bool = True
+    share_email: bool = False
+    share_phone: bool = False
+    share_mobile: bool = False
+    share_birthday: bool = False
+    share_address: bool = False
+    share_company: bool = False
+    share_job_title: bool = False
+
+    # ntfy connections toggle
+    ntfy_connections_enabled: bool = True
+
     created_at: datetime
     updated_at: datetime
 

backend/app/services/connection.py

@@ -0,0 +1,168 @@
+"""
+Connection service — shared profile resolution, Person creation, ntfy dispatch.
+
+SHAREABLE_FIELDS is the single source of truth for which fields can be shared.
+"""
+import asyncio
+import logging
+from typing import Optional
+
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.models.person import Person
+from app.models.settings import Settings
+from app.models.user import User
+from app.services.ntfy import send_ntfy_notification
+
+logger = logging.getLogger(__name__)
+
+# Single source of truth — only these fields can be shared via connections
+SHAREABLE_FIELDS = frozenset({
+    "preferred_name", "email", "phone", "mobile",
+    "birthday", "address", "company", "job_title",
+})
+
+# Maps shareable field names to their Settings model column names
+_SETTINGS_FIELD_MAP = {
+    "preferred_name": "preferred_name",
+    "email": None,  # email comes from User model, not Settings
+    "phone": "phone",
+    "mobile": "mobile",
+    "birthday": None,  # birthday comes from User model (date_of_birth)
+    "address": "address",
+    "company": "company",
+    "job_title": "job_title",
+}
+
+
+def resolve_shared_profile(
+    user: User,
+    settings: Settings,
+    overrides: Optional[dict] = None,
+) -> dict:
+    """
+    Merge global sharing defaults with per-connection overrides.
+    Returns {field: value} dict of fields the user is sharing.
+    Only fields in SHAREABLE_FIELDS are included.
+    """
+    overrides = overrides or {}
+    result = {}
+
+    for field in SHAREABLE_FIELDS:
+        # Determine if this field is shared: override wins, else global default
+        share_key = f"share_{field}"
+        global_share = getattr(settings, share_key, False)
+        is_shared = overrides.get(field, global_share)
+
+        if not is_shared:
+            continue
+
+        # Resolve the actual value
+        if field == "preferred_name":
+            result[field] = settings.preferred_name
+        elif field == "email":
+            result[field] = user.email
+        elif field == "birthday":
+            result[field] = str(user.date_of_birth) if user.date_of_birth else None
+        elif field in _SETTINGS_FIELD_MAP and _SETTINGS_FIELD_MAP[field]:
+            result[field] = getattr(settings, _SETTINGS_FIELD_MAP[field], None)
+
+    return result
+
+
+def create_person_from_connection(
+    owner_user_id: int,
+    connected_user: User,
+    connected_settings: Settings,
+    shared_profile: dict,
+) -> Person:
+    """Create a Person record for a new connection. Does NOT add to session — caller does."""
+    # Use shared preferred_name for display, fall back to umbral_name
+    first_name = shared_profile.get("preferred_name") or connected_user.umbral_name
+    email = shared_profile.get("email")
+    phone = shared_profile.get("phone")
+    mobile = shared_profile.get("mobile")
+    address = shared_profile.get("address")
+    company = shared_profile.get("company")
+    job_title = shared_profile.get("job_title")
+    birthday_str = shared_profile.get("birthday")
+
+    from datetime import date as date_type
+    birthday = None
+    if birthday_str:
+        try:
+            birthday = date_type.fromisoformat(birthday_str)
+        except (ValueError, TypeError):
+            pass
+
+    # Compute display name
+    display_name = first_name or connected_user.umbral_name
+
+    return Person(
+        user_id=owner_user_id,
+        name=display_name,
+        first_name=first_name,
+        email=email,
+        phone=phone,
+        mobile=mobile,
+        address=address,
+        company=company,
+        job_title=job_title,
+        birthday=birthday,
+        category="Umbral",
+        linked_user_id=connected_user.id,
+        is_umbral_contact=True,
+    )
+
+
+async def detach_umbral_contact(person: Person) -> None:
+    """Convert an umbral contact back to a standard contact. Does NOT commit."""
+    person.linked_user_id = None
+    person.is_umbral_contact = False
+    # Clear shared field values but preserve locally-entered data
+    # If no first_name exists, fill from the old name
+    if not person.first_name:
+        person.first_name = person.name or None
+
+
+async def send_connection_ntfy(
+    settings: Settings,
+    sender_name: str,
+    event_type: str,
+) -> None:
+    """Send ntfy push for connection events. Non-blocking with 3s timeout."""
+    if not settings.ntfy_connections_enabled:
+        return
+
+    title_map = {
+        "request_received": "New Connection Request",
+        "request_accepted": "Connection Accepted",
+    }
+    message_map = {
+        "request_received": f"{sender_name} wants to connect with you on Umbra",
+        "request_accepted": f"{sender_name} accepted your connection request",
+    }
+    tag_map = {
+        "request_received": ["handshake"],
+        "request_accepted": ["white_check_mark"],
+    }
+
+    title = title_map.get(event_type, "Connection Update")
+    message = message_map.get(event_type, f"Connection update from {sender_name}")
+    tags = tag_map.get(event_type, ["bell"])
+
+    try:
+        await asyncio.wait_for(
+            send_ntfy_notification(
+                settings=settings,
+                title=title,
+                message=message,
+                tags=tags,
+                priority=3,
+            ),
+            timeout=3.0,
+        )
+    except asyncio.TimeoutError:
+        logger.warning("ntfy connection push timed out for user_id=%s", settings.user_id)
+    except Exception:
+        logger.warning("ntfy connection push failed for user_id=%s", settings.user_id)

backend/app/services/notification.py

@@ -0,0 +1,34 @@
+"""
+In-app notification service.
+
+Creates notification records for the notification centre.
+Separate from ntfy push — in-app notifications are always created;
+ntfy push is gated by per-type toggles.
+"""
+from typing import Optional
+from sqlalchemy.ext.asyncio import AsyncSession
+from app.models.notification import Notification
+
+
+async def create_notification(
+    db: AsyncSession,
+    user_id: int,
+    type: str,
+    title: str,
+    message: str,
+    data: Optional[dict] = None,
+    source_type: Optional[str] = None,
+    source_id: Optional[int] = None,
+) -> Notification:
+    """Create an in-app notification. Does NOT commit — caller handles transaction."""
+    notification = Notification(
+        user_id=user_id,
+        type=type,
+        title=title,
+        message=message,
+        data=data,
+        source_type=source_type,
+        source_id=source_id,
+    )
+    db.add(notification)
+    return notification

frontend/nginx.conf

@@ -4,6 +4,9 @@ limit_req_zone $binary_remote_addr zone=auth_limit:10m rate=10r/m;
 limit_req_zone $binary_remote_addr zone=register_limit:10m rate=5r/m;
 # Admin API — generous for legitimate use but still guards against scraping/brute-force
 limit_req_zone $binary_remote_addr zone=admin_limit:10m rate=30r/m;
+# Connection endpoints — prevent search enumeration and request spam
+limit_req_zone $binary_remote_addr zone=conn_search_limit:10m rate=10r/m;
+limit_req_zone $binary_remote_addr zone=conn_request_limit:10m rate=3r/m;
 
 # Use X-Forwarded-Proto from upstream proxy when present, fall back to $scheme for direct access
 map $http_x_forwarded_proto $forwarded_proto {
@@ -82,6 +85,20 @@ server {
         include /etc/nginx/proxy-params.conf;
     }
 
+    # Connection search — rate-limited to prevent user enumeration
+    location /api/connections/search {
+        limit_req zone=conn_search_limit burst=5 nodelay;
+        limit_req_status 429;
+        include /etc/nginx/proxy-params.conf;
+    }
+
+    # Connection request — rate-limited to prevent spam
+    location /api/connections/request {
+        limit_req zone=conn_request_limit burst=3 nodelay;
+        limit_req_status 429;
+        include /etc/nginx/proxy-params.conf;
+    }
+
     # Admin API — rate-limited separately from general /api traffic
     location /api/admin/ {
         limit_req zone=admin_limit burst=10 nodelay;

frontend/src/App.tsx

@@ -12,6 +12,7 @@ import ProjectDetail from '@/components/projects/ProjectDetail';
 import PeoplePage from '@/components/people/PeoplePage';
 import LocationsPage from '@/components/locations/LocationsPage';
 import SettingsPage from '@/components/settings/SettingsPage';
+import NotificationsPage from '@/components/notifications/NotificationsPage';
 
 const AdminPortal = lazy(() => import('@/components/admin/AdminPortal'));
 
@@ -72,6 +73,7 @@ function App() {
         <Route path="projects/:id" element={<ProjectDetail />} />
         <Route path="people" element={<PeoplePage />} />
         <Route path="locations" element={<LocationsPage />} />
+        <Route path="notifications" element={<NotificationsPage />} />
         <Route path="settings" element={<SettingsPage />} />
         <Route
           path="admin/*"

frontend/src/components/admin/IAMPage.tsx

@@ -167,6 +167,9 @@ export default function IAMPage() {
                     <th className="px-5 py-3 text-left text-[11px] uppercase tracking-wider text-muted-foreground font-medium">
                       Username
                     </th>
+                    <th className="px-5 py-3 text-left text-[11px] uppercase tracking-wider text-muted-foreground font-medium">
+                      Umbral Name
+                    </th>
                     <th className="px-5 py-3 text-left text-[11px] uppercase tracking-wider text-muted-foreground font-medium">
                       Email
                     </th>
@@ -209,6 +212,9 @@ export default function IAMPage() {
                       )}
                     >
                       <td className="px-5 py-3 font-medium">{user.username}</td>
+                      <td className="px-5 py-3 text-muted-foreground text-xs">
+                        {user.umbral_name || user.username}
+                      </td>
                       <td className="px-5 py-3 text-muted-foreground text-xs">
                         {user.email || '—'}
                       </td>

frontend/src/components/connections/ConnectionRequestCard.tsx

@@ -0,0 +1,75 @@
+import { useState } from 'react';
+import { Check, X, Loader2 } from 'lucide-react';
+import { toast } from 'sonner';
+import { formatDistanceToNow } from 'date-fns';
+import { Button } from '@/components/ui/button';
+import { useConnections } from '@/hooks/useConnections';
+import { getErrorMessage } from '@/lib/api';
+import { cn } from '@/lib/utils';
+import type { ConnectionRequest } from '@/types';
+
+interface ConnectionRequestCardProps {
+  request: ConnectionRequest;
+}
+
+export default function ConnectionRequestCard({ request }: ConnectionRequestCardProps) {
+  const { respond, isResponding } = useConnections();
+  const [resolved, setResolved] = useState(false);
+
+  const handleRespond = async (action: 'accept' | 'reject') => {
+    try {
+      await respond({ requestId: request.id, action });
+      setResolved(true);
+      toast.success(action === 'accept' ? 'Connection accepted' : 'Request declined');
+    } catch (err) {
+      toast.error(getErrorMessage(err, 'Failed to respond'));
+    }
+  };
+
+  const displayName = request.sender_preferred_name || request.sender_umbral_name;
+
+  return (
+    <div
+      className={cn(
+        'flex items-center gap-3 rounded-lg border border-border p-3 transition-all duration-300',
+        resolved && 'opacity-0 translate-y-2'
+      )}
+    >
+      {/* Avatar */}
+      <div className="h-9 w-9 rounded-full bg-violet-500/15 flex items-center justify-center shrink-0">
+        <span className="text-sm font-medium text-violet-400">
+          {displayName.charAt(0).toUpperCase()}
+        </span>
+      </div>
+
+      {/* Content */}
+      <div className="flex-1 min-w-0">
+        <p className="text-sm font-medium truncate">{displayName}</p>
+        <p className="text-xs text-muted-foreground">
+          wants to connect · {formatDistanceToNow(new Date(request.created_at), { addSuffix: true })}
+        </p>
+      </div>
+
+      {/* Actions */}
+      <div className="flex items-center gap-1.5 shrink-0">
+        <Button
+          size="sm"
+          onClick={() => handleRespond('accept')}
+          disabled={isResponding}
+          className="gap-1"
+        >
+          {isResponding ? <Loader2 className="h-3.5 w-3.5 animate-spin" /> : <Check className="h-3.5 w-3.5" />}
+          Accept
+        </Button>
+        <Button
+          variant="ghost"
+          size="sm"
+          onClick={() => handleRespond('reject')}
+          disabled={isResponding}
+        >
+          <X className="h-3.5 w-3.5" />
+        </Button>
+      </div>
+    </div>
+  );
+}

frontend/src/components/connections/ConnectionSearch.tsx

@@ -0,0 +1,142 @@
+import { useState } from 'react';
+import { Search, UserPlus, Loader2, AlertCircle, CheckCircle } from 'lucide-react';
+import { toast } from 'sonner';
+import {
+  Dialog,
+  DialogContent,
+  DialogHeader,
+  DialogTitle,
+  DialogDescription,
+} from '@/components/ui/dialog';
+import { Input } from '@/components/ui/input';
+import { Button } from '@/components/ui/button';
+import { Label } from '@/components/ui/label';
+import { useConnections } from '@/hooks/useConnections';
+import { getErrorMessage } from '@/lib/api';
+
+interface ConnectionSearchProps {
+  open: boolean;
+  onOpenChange: (open: boolean) => void;
+}
+
+export default function ConnectionSearch({ open, onOpenChange }: ConnectionSearchProps) {
+  const { search, isSearching, sendRequest, isSending } = useConnections();
+  const [umbralName, setUmbralName] = useState('');
+  const [found, setFound] = useState<boolean | null>(null);
+  const [sent, setSent] = useState(false);
+
+  const handleSearch = async () => {
+    if (!umbralName.trim()) return;
+    setFound(null);
+    setSent(false);
+    try {
+      const result = await search(umbralName.trim());
+      setFound(result.found);
+    } catch {
+      setFound(false);
+    }
+  };
+
+  const handleSend = async () => {
+    try {
+      await sendRequest(umbralName.trim());
+      setSent(true);
+      toast.success('Connection request sent');
+    } catch (err) {
+      toast.error(getErrorMessage(err, 'Failed to send request'));
+    }
+  };
+
+  const handleClose = () => {
+    setUmbralName('');
+    setFound(null);
+    setSent(false);
+    onOpenChange(false);
+  };
+
+  return (
+    <Dialog open={open} onOpenChange={handleClose}>
+      <DialogContent className="sm:max-w-md">
+        <DialogHeader>
+          <DialogTitle className="flex items-center gap-2">
+            <UserPlus className="h-5 w-5 text-violet-400" />
+            Find Umbra User
+          </DialogTitle>
+          <DialogDescription>
+            Search for a user by their umbral name to send a connection request.
+          </DialogDescription>
+        </DialogHeader>
+        <div className="space-y-4 pt-2">
+          <div className="space-y-2">
+            <Label htmlFor="umbral_search">Umbral Name</Label>
+            <div className="flex gap-2">
+              <Input
+                id="umbral_search"
+                placeholder="Enter umbral name..."
+                value={umbralName}
+                onChange={(e) => {
+                  setUmbralName(e.target.value);
+                  setFound(null);
+                  setSent(false);
+                }}
+                onKeyDown={(e) => { if (e.key === 'Enter') handleSearch(); }}
+                maxLength={50}
+              />
+              <Button
+                onClick={handleSearch}
+                disabled={!umbralName.trim() || isSearching}
+                size="sm"
+              >
+                {isSearching ? (
+                  <Loader2 className="h-4 w-4 animate-spin" />
+                ) : (
+                  <Search className="h-4 w-4" />
+                )}
+              </Button>
+            </div>
+          </div>
+
+          {found === false && (
+            <div className="flex items-center gap-2 text-sm text-muted-foreground">
+              <AlertCircle className="h-4 w-4" />
+              User not found
+            </div>
+          )}
+
+          {found === true && !sent && (
+            <div className="flex items-center justify-between rounded-lg border border-border p-3">
+              <div className="flex items-center gap-2">
+                <div className="h-8 w-8 rounded-full bg-violet-500/15 flex items-center justify-center">
+                  <span className="text-sm font-medium text-violet-400">
+                    {umbralName.charAt(0).toUpperCase()}
+                  </span>
+                </div>
+                <span className="text-sm font-medium">{umbralName}</span>
+              </div>
+              <Button
+                onClick={handleSend}
+                disabled={isSending}
+                size="sm"
+                className="gap-1.5"
+              >
+                {isSending ? (
+                  <Loader2 className="h-3.5 w-3.5 animate-spin" />
+                ) : (
+                  <UserPlus className="h-3.5 w-3.5" />
+                )}
+                Send Request
+              </Button>
+            </div>
+          )}
+
+          {sent && (
+            <div className="flex items-center gap-2 text-sm text-green-400">
+              <CheckCircle className="h-4 w-4" />
+              Connection request sent
+            </div>
+          )}
+        </div>
+      </DialogContent>
+    </Dialog>
+  );
+}

frontend/src/components/layout/Sidebar.tsx

@@ -22,6 +22,7 @@ import { cn } from '@/lib/utils';
 import { useAuth } from '@/hooks/useAuth';
 import { useLock } from '@/hooks/useLock';
 import { useConfirmAction } from '@/hooks/useConfirmAction';
+import { useNotifications } from '@/hooks/useNotifications';
 import { Button } from '@/components/ui/button';
 import api from '@/lib/api';
 import type { Project } from '@/types';
@@ -47,6 +48,7 @@ export default function Sidebar({ collapsed, onToggle, mobileOpen, onMobileClose
   const location = useLocation();
   const { logout, isAdmin } = useAuth();
   const { lock } = useLock();
+  const { unreadCount } = useNotifications();
   const [projectsExpanded, setProjectsExpanded] = useState(false);
 
   const { data: trackedProjects } = useQuery({
@@ -194,6 +196,28 @@ export default function Sidebar({ collapsed, onToggle, mobileOpen, onMobileClose
           <Lock className="h-5 w-5 shrink-0" />
           {showExpanded && <span>Lock</span>}
         </button>
+        <NavLink
+          to="/notifications"
+          onClick={mobileOpen ? onMobileClose : undefined}
+          className={navLinkClass}
+        >
+          <div className="relative shrink-0">
+            <Bell className="h-5 w-5" />
+            {unreadCount > 0 && !showExpanded && (
+              <div className="absolute -top-1 -right-1 h-2 w-2 rounded-full bg-red-500" />
+            )}
+          </div>
+          {showExpanded && (
+            <span className="flex items-center gap-2">
+              Notifications
+              {unreadCount > 0 && (
+                <span className="text-[10px] bg-red-500/15 text-red-400 rounded-full px-1.5 py-0.5 tabular-nums">
+                  {unreadCount}
+                </span>
+              )}
+            </span>
+          )}
+        </NavLink>
         {isAdmin && (
           <NavLink
             to="/admin"

frontend/src/components/notifications/NotificationsPage.tsx

@@ -0,0 +1,203 @@
+import { useState, useMemo } from 'react';
+import { useNavigate } from 'react-router-dom';
+import { Bell, Check, CheckCheck, Trash2, UserPlus, Info, AlertCircle } from 'lucide-react';
+import { formatDistanceToNow } from 'date-fns';
+import { useNotifications } from '@/hooks/useNotifications';
+import { Button } from '@/components/ui/button';
+import { cn } from '@/lib/utils';
+import { ListSkeleton } from '@/components/ui/skeleton';
+import type { AppNotification } from '@/types';
+
+const typeIcons: Record<string, { icon: typeof Bell; color: string }> = {
+  connection_request: { icon: UserPlus, color: 'text-violet-400' },
+  connection_accepted: { icon: UserPlus, color: 'text-green-400' },
+  info: { icon: Info, color: 'text-blue-400' },
+  warning: { icon: AlertCircle, color: 'text-amber-400' },
+};
+
+type Filter = 'all' | 'unread';
+
+export default function NotificationsPage() {
+  const {
+    notifications,
+    unreadCount,
+    isLoading,
+    markRead,
+    markAllRead,
+    deleteNotification,
+  } = useNotifications();
+
+  const navigate = useNavigate();
+  const [filter, setFilter] = useState<Filter>('all');
+
+  const filtered = useMemo(() => {
+    if (filter === 'unread') return notifications.filter((n) => !n.is_read);
+    return notifications;
+  }, [notifications, filter]);
+
+  const handleMarkRead = async (id: number) => {
+    try {
+      await markRead([id]);
+    } catch { /* toast handled by mutation */ }
+  };
+
+  const handleDelete = async (id: number) => {
+    try {
+      await deleteNotification(id);
+    } catch { /* toast handled by mutation */ }
+  };
+
+  const handleMarkAllRead = async () => {
+    try {
+      await markAllRead();
+    } catch { /* toast handled by mutation */ }
+  };
+
+  const getIcon = (type: string) => {
+    const config = typeIcons[type] || { icon: Bell, color: 'text-muted-foreground' };
+    return config;
+  };
+
+  const handleNotificationClick = async (notification: AppNotification) => {
+    if (!notification.is_read) {
+      await markRead([notification.id]).catch(() => {});
+    }
+    // Navigate to People for connection-related notifications
+    if (notification.type === 'connection_request' || notification.type === 'connection_accepted') {
+      navigate('/people');
+    }
+  };
+
+  return (
+    <div className="flex flex-col h-full animate-fade-in">
+      {/* Page header */}
+      <div className="border-b bg-card px-6 h-16 flex items-center justify-between shrink-0">
+        <div className="flex items-center gap-3">
+          <Bell className="h-5 w-5 text-accent" aria-hidden="true" />
+          <h1 className="text-xl font-semibold font-heading">Notifications</h1>
+        </div>
+        <div className="flex items-center gap-2">
+          {/* Filter */}
+          <div className="flex items-center rounded-md border border-border overflow-hidden">
+            {(['all', 'unread'] as const).map((f) => (
+              <button
+                key={f}
+                onClick={() => setFilter(f)}
+                className={cn(
+                  'px-3 py-1.5 text-xs font-medium transition-colors capitalize',
+                  filter === f
+                    ? 'bg-accent/15 text-accent'
+                    : 'text-muted-foreground hover:text-foreground hover:bg-card-elevated'
+                )}
+              >
+                {f}
+                {f === 'unread' && unreadCount > 0 && (
+                  <span className="ml-1.5 text-[10px] bg-red-500/15 text-red-400 rounded-full px-1.5 py-0.5 tabular-nums">
+                    {unreadCount}
+                  </span>
+                )}
+              </button>
+            ))}
+          </div>
+          {unreadCount > 0 && (
+            <Button
+              variant="ghost"
+              size="sm"
+              onClick={handleMarkAllRead}
+              className="text-xs gap-1.5"
+            >
+              <CheckCheck className="h-3.5 w-3.5" />
+              Mark all read
+            </Button>
+          )}
+        </div>
+      </div>
+
+      {/* Content */}
+      <div className="flex-1 overflow-y-auto">
+        {isLoading ? (
+          <div className="p-6">
+            <ListSkeleton rows={5} />
+          </div>
+        ) : filtered.length === 0 ? (
+          <div className="flex flex-col items-center justify-center h-full text-muted-foreground gap-3 py-20">
+            <Bell className="h-10 w-10 opacity-30" />
+            <p className="text-sm">
+              {filter === 'unread' ? 'No unread notifications' : 'No notifications'}
+            </p>
+          </div>
+        ) : (
+          <div className="divide-y divide-border">
+            {filtered.map((notification) => {
+              const iconConfig = getIcon(notification.type);
+              const Icon = iconConfig.icon;
+              return (
+                <div
+                  key={notification.id}
+                  onClick={() => handleNotificationClick(notification)}
+                  className={cn(
+                    'flex items-start gap-3 px-6 py-3.5 transition-colors hover:bg-card-elevated group cursor-pointer',
+                    !notification.is_read && 'bg-card'
+                  )}
+                >
+                  {/* Type icon */}
+                  <div className={cn('mt-0.5 shrink-0', iconConfig.color)}>
+                    <Icon className="h-4 w-4" />
+                  </div>
+
+                  {/* Content */}
+                  <div className="flex-1 min-w-0">
+                    <div className="flex items-start gap-2">
+                      <div className="flex-1 min-w-0">
+                        <p className={cn(
+                          'text-sm truncate',
+                          !notification.is_read ? 'font-medium text-foreground' : 'text-muted-foreground'
+                        )}>
+                          {notification.title}
+                        </p>
+                        {notification.message && (
+                          <p className="text-xs text-muted-foreground mt-0.5 line-clamp-2">
+                            {notification.message}
+                          </p>
+                        )}
+                      </div>
+                      {/* Unread dot */}
+                      {!notification.is_read && (
+                        <div className="h-2 w-2 rounded-full bg-accent shrink-0 mt-1.5" />
+                      )}
+                    </div>
+                  </div>
+
+                  {/* Timestamp + actions */}
+                  <div className="flex items-center gap-1.5 shrink-0">
+                    <span className="text-[11px] text-muted-foreground tabular-nums">
+                      {formatDistanceToNow(new Date(notification.created_at), { addSuffix: true })}
+                    </span>
+                    <div className="flex items-center gap-0.5 opacity-0 group-hover:opacity-100 transition-opacity">
+                      {!notification.is_read && (
+                        <button
+                          onClick={() => handleMarkRead(notification.id)}
+                          className="p-1 rounded hover:bg-accent/10 text-muted-foreground hover:text-accent transition-colors"
+                          title="Mark as read"
+                        >
+                          <Check className="h-3.5 w-3.5" />
+                        </button>
+                      )}
+                      <button
+                        onClick={() => handleDelete(notification.id)}
+                        className="p-1 rounded hover:bg-destructive/10 text-muted-foreground hover:text-destructive transition-colors"
+                        title="Delete"
+                      >
+                        <Trash2 className="h-3.5 w-3.5" />
+                      </button>
+                    </div>
+                  </div>
+                </div>
+              );
+            })}
+          </div>
+        )}
+      </div>
+    </div>
+  );
+}

frontend/src/components/people/PeoplePage.tsx

@@ -1,5 +1,5 @@
 import { useState, useMemo, useRef, useEffect } from 'react';
-import { Plus, Users, Star, Cake, Phone, Mail, MapPin, Tag, Building2, Briefcase, AlignLeft } from 'lucide-react';
+import { Plus, Users, Star, Cake, Phone, Mail, MapPin, Tag, Building2, Briefcase, AlignLeft, Ghost, ChevronDown } from 'lucide-react';
 import type { LucideIcon } from 'lucide-react';
 import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
 import { format, parseISO, differenceInYears } from 'date-fns';
@@ -23,6 +23,7 @@ import {
 import { useTableVisibility } from '@/hooks/useTableVisibility';
 import { useCategoryOrder } from '@/hooks/useCategoryOrder';
 import PersonForm from './PersonForm';
+import ConnectionSearch from '@/components/connections/ConnectionSearch';
 
 // ---------------------------------------------------------------------------
 // StatCounter — inline helper
@@ -98,6 +99,9 @@ const columns: ColumnDef<Person>[] = [
             {getInitials(initialsName)}
           </div>
           <span className="font-medium truncate">{p.nickname || p.name}</span>
+          {p.is_umbral_contact && (
+            <Ghost className="h-3.5 w-3.5 text-violet-400 shrink-0" aria-label="Umbral contact" />
+          )}
         </div>
       );
     },
@@ -193,9 +197,13 @@ export default function PeoplePage() {
   const [editingPerson, setEditingPerson] = useState<Person | null>(null);
   const [activeFilters, setActiveFilters] = useState<string[]>([]);
   const [showPinned, setShowPinned] = useState(true);
+  const [showUmbralOnly, setShowUmbralOnly] = useState(false);
   const [search, setSearch] = useState('');
   const [sortKey, setSortKey] = useState<string>('name');
   const [sortDir, setSortDir] = useState<'asc' | 'desc'>('asc');
+  const [showConnectionSearch, setShowConnectionSearch] = useState(false);
+  const [showAddDropdown, setShowAddDropdown] = useState(false);
+  const addDropdownRef = useRef<HTMLDivElement>(null);
 
   const { data: people = [], isLoading } = useQuery({
     queryKey: ['people'],
@@ -228,6 +236,10 @@ export default function PeoplePage() {
       ? people.filter((p) => !p.is_favourite)
       : people;
 
+    if (showUmbralOnly) {
+      list = list.filter((p) => p.is_umbral_contact);
+    }
+
     if (activeFilters.length > 0) {
       list = list.filter((p) => p.category && activeFilters.includes(p.category));
     }
@@ -249,7 +261,7 @@ export default function PeoplePage() {
     }
 
     return sortPeople(list, sortKey, sortDir);
-  }, [people, showPinned, activeFilters, search, sortKey, sortDir]);
+  }, [people, showPinned, showUmbralOnly, activeFilters, search, sortKey, sortDir]);
 
   // Build row groups for the table — ordered by custom category order
   const groups = useMemo(() => {
@@ -347,6 +359,18 @@ export default function PeoplePage() {
     return () => document.removeEventListener('keydown', handler);
   }, [panelOpen]);
 
+  // Close add dropdown on outside click
+  useEffect(() => {
+    if (!showAddDropdown) return;
+    const handler = (e: MouseEvent) => {
+      if (addDropdownRef.current && !addDropdownRef.current.contains(e.target as Node)) {
+        setShowAddDropdown(false);
+      }
+    };
+    document.addEventListener('mousedown', handler);
+    return () => document.removeEventListener('mousedown', handler);
+  }, [showAddDropdown]);
+
   const handleCloseForm = () => {
     setShowForm(false);
     setEditingPerson(null);
@@ -363,7 +387,12 @@ export default function PeoplePage() {
           {getInitials(initialsName)}
         </div>
         <div className="min-w-0">
+          <div className="flex items-center gap-2">
             <h3 className="font-heading text-lg font-semibold truncate">{p.name}</h3>
+            {p.is_umbral_contact && (
+              <Ghost className="h-4 w-4 text-violet-400 shrink-0" />
+            )}
+          </div>
           {p.category && (
             <span className="text-xs text-muted-foreground">{p.category}</span>
           )}
@@ -372,8 +401,49 @@ export default function PeoplePage() {
     );
   };
 
-  // Panel getValue
+  // Shared field key mapping (panel key -> shared_fields key)
+  const sharedKeyMap: Record<string, string> = {
+    email: 'email',
+    phone: 'phone',
+    mobile: 'mobile',
+    birthday_display: 'birthday',
+    address: 'address',
+    company: 'company',
+    job_title: 'job_title',
+  };
+
+  // Build dynamic panel fields with synced labels for shared fields
+  const dynamicPanelFields = useMemo((): PanelField[] => {
+    if (!selectedPerson?.is_umbral_contact || !selectedPerson.shared_fields) return panelFields;
+    const shared = selectedPerson.shared_fields;
+    return panelFields.map((f) => {
+      const sharedKey = sharedKeyMap[f.key];
+      if (sharedKey && sharedKey in shared) {
+        return { ...f, label: `${f.label} (synced)` };
+      }
+      return f;
+    });
+  }, [selectedPerson]);
+
+  // Panel getValue — overlays shared fields from connected user
   const getPanelValue = (p: Person, key: string): string | undefined => {
+    // Check shared fields first for umbral contacts
+    if (p.is_umbral_contact && p.shared_fields) {
+      const sharedKey = sharedKeyMap[key];
+      if (sharedKey && sharedKey in p.shared_fields) {
+        const sharedVal = p.shared_fields[sharedKey];
+        if (key === 'birthday_display' && sharedVal) {
+          const bd = String(sharedVal);
+          try {
+            const age = differenceInYears(new Date(), parseISO(bd));
+            return `${format(parseISO(bd), 'MMM d, yyyy')} (${age})`;
+          } catch {
+            return bd;
+          }
+        }
+        return sharedVal != null ? String(sharedVal) : undefined;
+      }
+    }
     if (key === 'birthday_display' && p.birthday) {
       const age = differenceInYears(new Date(), parseISO(p.birthday));
       return `${format(parseISO(p.birthday), 'MMM d, yyyy')} (${age})`;
@@ -385,7 +455,7 @@ export default function PeoplePage() {
   const renderPanel = () => (
     <EntityDetailPanel<Person>
       item={selectedPerson}
-      fields={panelFields}
+      fields={dynamicPanelFields}
       onEdit={() => {
         setEditingPerson(selectedPerson);
         setShowForm(true);
@@ -420,12 +490,53 @@ export default function PeoplePage() {
             onReorderCategories={reorderCategories}
             searchValue={search}
             onSearchChange={setSearch}
+            extraPinnedFilters={[
+              {
+                label: 'Umbral',
+                isActive: showUmbralOnly,
+                onToggle: () => setShowUmbralOnly((p) => !p),
+              },
+            ]}
           />
         </div>
-        <Button onClick={() => setShowForm(true)} size="sm" aria-label="Add person">
+        <div className="relative" ref={addDropdownRef}>
+          <div className="flex">
+            <Button
+              onClick={() => setShowForm(true)}
+              size="sm"
+              aria-label="Add person"
+              className="rounded-r-none"
+            >
               <Plus className="mr-2 h-4 w-4" />
               Add Person
             </Button>
+            <Button
+              size="sm"
+              onClick={() => setShowAddDropdown((p) => !p)}
+              aria-label="More add options"
+              className="rounded-l-none border-l border-background/20 px-1.5"
+            >
+              <ChevronDown className="h-3.5 w-3.5" />
+            </Button>
+          </div>
+          {showAddDropdown && (
+            <div className="absolute right-0 top-full mt-1 w-44 rounded-md border border-border bg-card shadow-lg z-50 py-1">
+              <button
+                className="w-full text-left px-3 py-1.5 text-sm hover:bg-card-elevated transition-colors"
+                onClick={() => { setShowAddDropdown(false); setShowForm(true); }}
+              >
+                Standard Contact
+              </button>
+              <button
+                className="w-full text-left px-3 py-1.5 text-sm hover:bg-card-elevated transition-colors flex items-center gap-2"
+                onClick={() => { setShowAddDropdown(false); setShowConnectionSearch(true); }}
+              >
+                <Ghost className="h-3.5 w-3.5 text-violet-400" />
+                Umbra Contact
+              </button>
+            </div>
+          )}
+        </div>
       </div>
 
       <div className="flex-1 overflow-hidden flex flex-col">
@@ -558,6 +669,11 @@ export default function PeoplePage() {
           onClose={handleCloseForm}
         />
       )}
+
+      <ConnectionSearch
+        open={showConnectionSearch}
+        onOpenChange={setShowConnectionSearch}
+      />
     </div>
   );
 }

frontend/src/components/people/PersonForm.tsx

@@ -1,7 +1,7 @@
 import { useState, useMemo, FormEvent } from 'react';
 import { useMutation, useQueryClient } from '@tanstack/react-query';
 import { toast } from 'sonner';
-import { Star, StarOff, X } from 'lucide-react';
+import { Star, StarOff, X, Lock } from 'lucide-react';
 import { parseISO, differenceInYears } from 'date-fns';
 import api, { getErrorMessage } from '@/lib/api';
 import type { Person } from '@/types';
@@ -30,6 +30,11 @@ interface PersonFormProps {
 export default function PersonForm({ person, categories, onClose }: PersonFormProps) {
   const queryClient = useQueryClient();
 
+  // Helper to resolve a field value — prefer shared_fields for umbral contacts
+  const sf = person?.shared_fields;
+  const shared = (key: string, fallback: string) =>
+    sf && key in sf && sf[key] != null ? String(sf[key]) : fallback;
+
   const [formData, setFormData] = useState({
     first_name:
       person?.first_name ||
@@ -38,20 +43,24 @@ export default function PersonForm({ person, categories, onClose }: PersonFormPr
       person?.last_name ||
       (person?.name ? splitName(person.name).lastName : ''),
     nickname: person?.nickname || '',
-    email: person?.email || '',
-    phone: person?.phone || '',
-    mobile: person?.mobile || '',
-    address: person?.address || '',
-    birthday: person?.birthday
-      ? person.birthday.slice(0, 10)
-      : '',
+    email: shared('email', person?.email || ''),
+    phone: shared('phone', person?.phone || ''),
+    mobile: shared('mobile', person?.mobile || ''),
+    address: shared('address', person?.address || ''),
+    birthday: shared('birthday', person?.birthday ? person.birthday.slice(0, 10) : ''),
     category: person?.category || '',
     is_favourite: person?.is_favourite ?? false,
-    company: person?.company || '',
-    job_title: person?.job_title || '',
+    company: shared('company', person?.company || ''),
+    job_title: shared('job_title', person?.job_title || ''),
     notes: person?.notes || '',
   });
 
+  // Check if a field is synced from an umbral connection (read-only)
+  const isShared = (fieldKey: string): boolean => {
+    if (!person?.is_umbral_contact || !person.shared_fields) return false;
+    return fieldKey in person.shared_fields;
+  };
+
   const age = useMemo(() => {
     if (!formData.birthday) return null;
     try {
@@ -165,13 +174,25 @@ export default function PersonForm({ person, categories, onClose }: PersonFormPr
             {/* Row 4: Birthday + Age */}
             <div className="grid grid-cols-2 gap-4">
               <div className="space-y-2">
-                <Label htmlFor="birthday">Birthday</Label>
+                <Label htmlFor="birthday" className="flex items-center gap-1">
+                  Birthday
+                  {isShared('birthday') && <Lock className="h-3 w-3 text-violet-400" />}
+                </Label>
+                {isShared('birthday') ? (
+                  <Input
+                    id="birthday"
+                    value={formData.birthday}
+                    disabled
+                    className="opacity-70 cursor-not-allowed"
+                  />
+                ) : (
                 <DatePicker
                   variant="input"
                   id="birthday"
                   value={formData.birthday}
                   onChange={(v) => set('birthday', v)}
                 />
+                )}
               </div>
               <div className="space-y-2">
                 <Label htmlFor="age">Age</Label>
@@ -200,40 +221,66 @@ export default function PersonForm({ person, categories, onClose }: PersonFormPr
             {/* Row 6: Mobile + Email */}
             <div className="grid grid-cols-2 gap-4">
               <div className="space-y-2">
-                <Label htmlFor="mobile">Mobile</Label>
+                <Label htmlFor="mobile" className="flex items-center gap-1">
+                  Mobile
+                  {isShared('mobile') && <Lock className="h-3 w-3 text-violet-400" />}
+                </Label>
                 <Input
                   id="mobile"
                   type="tel"
                   value={formData.mobile}
                   onChange={(e) => set('mobile', e.target.value)}
+                  disabled={isShared('mobile')}
+                  className={isShared('mobile') ? 'opacity-70 cursor-not-allowed' : ''}
                 />
               </div>
               <div className="space-y-2">
-                <Label htmlFor="email">Email</Label>
+                <Label htmlFor="email" className="flex items-center gap-1">
+                  Email
+                  {isShared('email') && <Lock className="h-3 w-3 text-violet-400" />}
+                </Label>
                 <Input
                   id="email"
                   type="email"
                   value={formData.email}
                   onChange={(e) => set('email', e.target.value)}
+                  disabled={isShared('email')}
+                  className={isShared('email') ? 'opacity-70 cursor-not-allowed' : ''}
                 />
               </div>
             </div>
 
             {/* Row 7: Phone */}
             <div className="space-y-2">
-              <Label htmlFor="phone">Phone</Label>
+              <Label htmlFor="phone" className="flex items-center gap-1">
+                Phone
+                {isShared('phone') && <Lock className="h-3 w-3 text-violet-400" />}
+              </Label>
               <Input
                 id="phone"
                 type="tel"
                 value={formData.phone}
                 onChange={(e) => set('phone', e.target.value)}
                 placeholder="Landline / work number"
+                disabled={isShared('phone')}
+                className={isShared('phone') ? 'opacity-70 cursor-not-allowed' : ''}
               />
             </div>
 
             {/* Row 8: Address */}
             <div className="space-y-2">
-              <Label htmlFor="address">Address</Label>
+              <Label htmlFor="address" className="flex items-center gap-1">
+                Address
+                {isShared('address') && <Lock className="h-3 w-3 text-violet-400" />}
+              </Label>
+              {isShared('address') ? (
+                <Input
+                  id="address"
+                  value={formData.address}
+                  disabled
+                  className="opacity-70 cursor-not-allowed"
+                />
+              ) : (
                 <LocationPicker
                   id="address"
                   value={formData.address}
@@ -241,24 +288,35 @@ export default function PersonForm({ person, categories, onClose }: PersonFormPr
                   onSelect={(result) => set('address', result.address || result.name)}
                   placeholder="Search or enter address..."
                 />
+              )}
             </div>
 
             {/* Row 9: Company + Job Title */}
             <div className="grid grid-cols-2 gap-4">
               <div className="space-y-2">
-                <Label htmlFor="company">Company</Label>
+                <Label htmlFor="company" className="flex items-center gap-1">
+                  Company
+                  {isShared('company') && <Lock className="h-3 w-3 text-violet-400" />}
+                </Label>
                 <Input
                   id="company"
                   value={formData.company}
                   onChange={(e) => set('company', e.target.value)}
+                  disabled={isShared('company')}
+                  className={isShared('company') ? 'opacity-70 cursor-not-allowed' : ''}
                 />
               </div>
               <div className="space-y-2">
-                <Label htmlFor="job_title">Job Title</Label>
+                <Label htmlFor="job_title" className="flex items-center gap-1">
+                  Job Title
+                  {isShared('job_title') && <Lock className="h-3 w-3 text-violet-400" />}
+                </Label>
                 <Input
                   id="job_title"
                   value={formData.job_title}
                   onChange={(e) => set('job_title', e.target.value)}
+                  disabled={isShared('job_title')}
+                  className={isShared('job_title') ? 'opacity-70 cursor-not-allowed' : ''}
                 />
               </div>
             </div>

frontend/src/components/settings/SettingsPage.tsx

@@ -14,6 +14,7 @@ import {
   Loader2,
   Shield,
   Blocks,
+  Ghost,
 } from 'lucide-react';
 import { useSettings } from '@/hooks/useSettings';
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
@@ -24,6 +25,7 @@ import { cn } from '@/lib/utils';
 import api from '@/lib/api';
 import type { GeoLocation, UserProfile } from '@/types';
 import { Switch } from '@/components/ui/switch';
+import CopyableField from '@/components/shared/CopyableField';
 import TotpSetupSection from './TotpSetupSection';
 import NtfySettingsSection from './NtfySettingsSection';
 
@@ -55,6 +57,24 @@ export default function SettingsPage() {
   const [autoLockEnabled, setAutoLockEnabled] = useState(settings?.auto_lock_enabled ?? false);
   const [autoLockMinutes, setAutoLockMinutes] = useState<number | string>(settings?.auto_lock_minutes ?? 5);
 
+  // Profile extension fields (stored on Settings model)
+  const [settingsPhone, setSettingsPhone] = useState(settings?.phone ?? '');
+  const [settingsMobile, setSettingsMobile] = useState(settings?.mobile ?? '');
+  const [settingsAddress, setSettingsAddress] = useState(settings?.address ?? '');
+  const [settingsCompany, setSettingsCompany] = useState(settings?.company ?? '');
+  const [settingsJobTitle, setSettingsJobTitle] = useState(settings?.job_title ?? '');
+
+  // Social settings
+  const [acceptConnections, setAcceptConnections] = useState(settings?.accept_connections ?? false);
+  const [sharePreferredName, setSharePreferredName] = useState(settings?.share_preferred_name ?? true);
+  const [shareEmail, setShareEmail] = useState(settings?.share_email ?? false);
+  const [sharePhone, setSharePhone] = useState(settings?.share_phone ?? false);
+  const [shareMobile, setShareMobile] = useState(settings?.share_mobile ?? false);
+  const [shareBirthday, setShareBirthday] = useState(settings?.share_birthday ?? false);
+  const [shareAddress, setShareAddress] = useState(settings?.share_address ?? false);
+  const [shareCompany, setShareCompany] = useState(settings?.share_company ?? false);
+  const [shareJobTitle, setShareJobTitle] = useState(settings?.share_job_title ?? false);
+
   // Profile fields (stored on User model, fetched from /auth/profile)
   const profileQuery = useQuery({
     queryKey: ['profile'],
@@ -87,6 +107,20 @@ export default function SettingsPage() {
       setFirstDayOfWeek(settings.first_day_of_week);
       setAutoLockEnabled(settings.auto_lock_enabled);
       setAutoLockMinutes(settings.auto_lock_minutes ?? 5);
+      setSettingsPhone(settings.phone ?? '');
+      setSettingsMobile(settings.mobile ?? '');
+      setSettingsAddress(settings.address ?? '');
+      setSettingsCompany(settings.company ?? '');
+      setSettingsJobTitle(settings.job_title ?? '');
+      setAcceptConnections(settings.accept_connections);
+      setSharePreferredName(settings.share_preferred_name);
+      setShareEmail(settings.share_email);
+      setSharePhone(settings.share_phone);
+      setShareMobile(settings.share_mobile);
+      setShareBirthday(settings.share_birthday);
+      setShareAddress(settings.share_address);
+      setShareCompany(settings.share_company);
+      setShareJobTitle(settings.share_job_title);
     }
   }, [settings?.id]); // only re-sync on initial load (settings.id won't change)
 
@@ -248,6 +282,29 @@ export default function SettingsPage() {
     }
   };
 
+  const handleSettingsFieldSave = async (field: string, value: string) => {
+    const trimmed = value.trim();
+    const currentVal = (settings as any)?.[field] || '';
+    if (trimmed === (currentVal || '')) return;
+    try {
+      await updateSettings({ [field]: trimmed || null } as any);
+      toast.success('Profile updated');
+    } catch {
+      toast.error('Failed to update profile');
+    }
+  };
+
+  const handleSocialToggle = async (field: string, checked: boolean, setter: (v: boolean) => void) => {
+    const previous = (settings as any)?.[field];
+    setter(checked);
+    try {
+      await updateSettings({ [field]: checked } as any);
+    } catch {
+      setter(previous);
+      toast.error('Failed to update setting');
+    }
+  };
+
   const handleAutoLockMinutesSave = async () => {
     const raw = typeof autoLockMinutes === 'string' ? parseInt(autoLockMinutes) : autoLockMinutes;
     const clamped = Math.max(1, Math.min(60, isNaN(raw) ? 5 : raw));
@@ -363,6 +420,75 @@ export default function SettingsPage() {
                       onKeyDown={(e) => { if (e.key === 'Enter') handleProfileSave('date_of_birth'); }}
                     />
                   </div>
+                  <div className="grid grid-cols-2 gap-3">
+                    <div className="space-y-2">
+                      <Label htmlFor="settings_phone">Phone</Label>
+                      <Input
+                        id="settings_phone"
+                        type="tel"
+                        placeholder="Phone number"
+                        value={settingsPhone}
+                        onChange={(e) => setSettingsPhone(e.target.value)}
+                        onBlur={() => handleSettingsFieldSave('phone', settingsPhone)}
+                        onKeyDown={(e) => { if (e.key === 'Enter') handleSettingsFieldSave('phone', settingsPhone); }}
+                        maxLength={50}
+                      />
+                    </div>
+                    <div className="space-y-2">
+                      <Label htmlFor="settings_mobile">Mobile</Label>
+                      <Input
+                        id="settings_mobile"
+                        type="tel"
+                        placeholder="Mobile number"
+                        value={settingsMobile}
+                        onChange={(e) => setSettingsMobile(e.target.value)}
+                        onBlur={() => handleSettingsFieldSave('mobile', settingsMobile)}
+                        onKeyDown={(e) => { if (e.key === 'Enter') handleSettingsFieldSave('mobile', settingsMobile); }}
+                        maxLength={50}
+                      />
+                    </div>
+                  </div>
+                  <div className="space-y-2">
+                    <Label htmlFor="settings_address">Address</Label>
+                    <Input
+                      id="settings_address"
+                      type="text"
+                      placeholder="Your address"
+                      value={settingsAddress}
+                      onChange={(e) => setSettingsAddress(e.target.value)}
+                      onBlur={() => handleSettingsFieldSave('address', settingsAddress)}
+                      onKeyDown={(e) => { if (e.key === 'Enter') handleSettingsFieldSave('address', settingsAddress); }}
+                      maxLength={2000}
+                    />
+                  </div>
+                  <div className="grid grid-cols-2 gap-3">
+                    <div className="space-y-2">
+                      <Label htmlFor="settings_company">Company</Label>
+                      <Input
+                        id="settings_company"
+                        type="text"
+                        placeholder="Company name"
+                        value={settingsCompany}
+                        onChange={(e) => setSettingsCompany(e.target.value)}
+                        onBlur={() => handleSettingsFieldSave('company', settingsCompany)}
+                        onKeyDown={(e) => { if (e.key === 'Enter') handleSettingsFieldSave('company', settingsCompany); }}
+                        maxLength={255}
+                      />
+                    </div>
+                    <div className="space-y-2">
+                      <Label htmlFor="settings_job_title">Job Title</Label>
+                      <Input
+                        id="settings_job_title"
+                        type="text"
+                        placeholder="Your role"
+                        value={settingsJobTitle}
+                        onChange={(e) => setSettingsJobTitle(e.target.value)}
+                        onBlur={() => handleSettingsFieldSave('job_title', settingsJobTitle)}
+                        onKeyDown={(e) => { if (e.key === 'Enter') handleSettingsFieldSave('job_title', settingsJobTitle); }}
+                        maxLength={255}
+                      />
+                    </div>
+                  </div>
                 </CardContent>
               </Card>
 
@@ -586,9 +712,77 @@ export default function SettingsPage() {
 
             </div>
 
-            {/* ── Right column: Security, Authentication, Integrations ── */}
+            {/* ── Right column: Social, Security, Authentication, Integrations ── */}
             <div className="space-y-6">
 
+              {/* Social */}
+              <Card>
+                <CardHeader>
+                  <div className="flex items-center gap-3">
+                    <div className="p-1.5 rounded-md bg-violet-500/10">
+                      <Ghost className="h-4 w-4 text-violet-400" aria-hidden="true" />
+                    </div>
+                    <div>
+                      <CardTitle>Social</CardTitle>
+                      <CardDescription>Manage your Umbra identity and connections</CardDescription>
+                    </div>
+                  </div>
+                </CardHeader>
+                <CardContent className="space-y-4">
+                  <div className="space-y-2">
+                    <Label>Umbral Name</Label>
+                    <div className="flex items-center gap-3">
+                      <Input
+                        value={profileQuery.data?.username ?? ''}
+                        disabled
+                        className="opacity-70 cursor-not-allowed"
+                      />
+                      <CopyableField value={profileQuery.data?.username ?? ''} label="Umbral name" />
+                    </div>
+                    <p className="text-sm text-muted-foreground">
+                      How other Umbra users find you
+                    </p>
+                  </div>
+                  <div className="flex items-center justify-between">
+                    <div className="space-y-0.5">
+                      <Label>Accept Connections</Label>
+                      <p className="text-sm text-muted-foreground">
+                        Allow other users to find and connect with you
+                      </p>
+                    </div>
+                    <Switch
+                      checked={acceptConnections}
+                      onCheckedChange={(checked) => handleSocialToggle('accept_connections', checked, setAcceptConnections)}
+                    />
+                  </div>
+                  <div className="border-t border-border pt-4 mt-4">
+                    <p className="text-[11px] uppercase tracking-wider text-muted-foreground mb-3">
+                      Sharing Defaults
+                    </p>
+                    <div className="grid grid-cols-2 gap-3">
+                      {[
+                        { field: 'share_preferred_name', label: 'Preferred Name', state: sharePreferredName, setter: setSharePreferredName },
+                        { field: 'share_email', label: 'Email', state: shareEmail, setter: setShareEmail },
+                        { field: 'share_phone', label: 'Phone', state: sharePhone, setter: setSharePhone },
+                        { field: 'share_mobile', label: 'Mobile', state: shareMobile, setter: setShareMobile },
+                        { field: 'share_birthday', label: 'Birthday', state: shareBirthday, setter: setShareBirthday },
+                        { field: 'share_address', label: 'Address', state: shareAddress, setter: setShareAddress },
+                        { field: 'share_company', label: 'Company', state: shareCompany, setter: setShareCompany },
+                        { field: 'share_job_title', label: 'Job Title', state: shareJobTitle, setter: setShareJobTitle },
+                      ].map(({ field, label, state, setter }) => (
+                        <div key={field} className="flex items-center justify-between">
+                          <Label className="text-sm font-normal">{label}</Label>
+                          <Switch
+                            checked={state}
+                            onCheckedChange={(checked) => handleSocialToggle(field, checked, setter)}
+                          />
+                        </div>
+                      ))}
+                    </div>
+                  </div>
+                </CardContent>
+              </Card>
+
               {/* Security (auto-lock) */}
               <Card>
                 <CardHeader>

frontend/src/components/shared/CategoryFilterBar.tsx

@@ -18,6 +18,12 @@ import {
 } from '@dnd-kit/sortable';
 import { CSS } from '@dnd-kit/utilities';
 
+interface ExtraPinnedFilter {
+  label: string;
+  isActive: boolean;
+  onToggle: () => void;
+}
+
 interface CategoryFilterBarProps {
   activeFilters: string[];
   pinnedLabel: string;
@@ -30,6 +36,7 @@ interface CategoryFilterBarProps {
   onReorderCategories?: (order: string[]) => void;
   searchValue: string;
   onSearchChange: (val: string) => void;
+  extraPinnedFilters?: ExtraPinnedFilter[];
 }
 
 const pillBase =
@@ -116,6 +123,7 @@ export default function CategoryFilterBar({
   onReorderCategories,
   searchValue,
   onSearchChange,
+  extraPinnedFilters = [],
 }: CategoryFilterBarProps) {
   const [otherOpen, setOtherOpen] = useState(false);
   const searchInputRef = useRef<HTMLInputElement>(null);
@@ -169,6 +177,22 @@ export default function CategoryFilterBar({
         </span>
       </button>
 
+      {/* Extra pinned filters (e.g. "Umbral") */}
+      {extraPinnedFilters.map((epf) => (
+        <button
+          key={epf.label}
+          type="button"
+          onClick={epf.onToggle}
+          aria-label={`Filter by ${epf.label}`}
+          className={pillBase}
+          style={epf.isActive ? activePillStyle : undefined}
+        >
+          <span className={epf.isActive ? '' : 'text-muted-foreground hover:text-foreground'}>
+            {epf.label}
+          </span>
+        </button>
+      ))}
+
       {/* Categories pill + expandable chips */}
       {categories.length > 0 && (
         <>

frontend/src/hooks/useConnections.ts

@@ -0,0 +1,88 @@
+import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
+import api from '@/lib/api';
+import type { Connection, ConnectionRequest, UmbralSearchResponse } from '@/types';
+
+export function useConnections() {
+  const queryClient = useQueryClient();
+
+  const connectionsQuery = useQuery({
+    queryKey: ['connections'],
+    queryFn: async () => {
+      const { data } = await api.get<Connection[]>('/connections');
+      return data;
+    },
+  });
+
+  const incomingQuery = useQuery({
+    queryKey: ['connections', 'incoming'],
+    queryFn: async () => {
+      const { data } = await api.get<ConnectionRequest[]>('/connections/requests/incoming');
+      return data;
+    },
+  });
+
+  const outgoingQuery = useQuery({
+    queryKey: ['connections', 'outgoing'],
+    queryFn: async () => {
+      const { data } = await api.get<ConnectionRequest[]>('/connections/requests/outgoing');
+      return data;
+    },
+  });
+
+  const searchMutation = useMutation({
+    mutationFn: async (umbralName: string) => {
+      const { data } = await api.post<UmbralSearchResponse>('/connections/search', {
+        umbral_name: umbralName,
+      });
+      return data;
+    },
+  });
+
+  const sendRequestMutation = useMutation({
+    mutationFn: async (umbralName: string) => {
+      const { data } = await api.post('/connections/request', {
+        umbral_name: umbralName,
+      });
+      return data;
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['connections'] });
+    },
+  });
+
+  const respondMutation = useMutation({
+    mutationFn: async ({ requestId, action }: { requestId: number; action: 'accept' | 'reject' }) => {
+      const { data } = await api.put(`/connections/requests/${requestId}/respond`, { action });
+      return data;
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['connections'] });
+      queryClient.invalidateQueries({ queryKey: ['people'] });
+      queryClient.invalidateQueries({ queryKey: ['notifications'] });
+    },
+  });
+
+  const removeConnectionMutation = useMutation({
+    mutationFn: async (connectionId: number) => {
+      await api.delete(`/connections/${connectionId}`);
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['connections'] });
+      queryClient.invalidateQueries({ queryKey: ['people'] });
+    },
+  });
+
+  return {
+    connections: connectionsQuery.data ?? [],
+    incomingRequests: incomingQuery.data ?? [],
+    outgoingRequests: outgoingQuery.data ?? [],
+    isLoading: connectionsQuery.isLoading,
+    search: searchMutation.mutateAsync,
+    isSearching: searchMutation.isPending,
+    sendRequest: sendRequestMutation.mutateAsync,
+    isSending: sendRequestMutation.isPending,
+    respond: respondMutation.mutateAsync,
+    isResponding: respondMutation.isPending,
+    removeConnection: removeConnectionMutation.mutateAsync,
+  };
+}

frontend/src/hooks/useNotifications.ts

@@ -0,0 +1,76 @@
+import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
+import { useEffect, useRef } from 'react';
+import api from '@/lib/api';
+import type { NotificationListResponse } from '@/types';
+
+export function useNotifications() {
+  const queryClient = useQueryClient();
+  const visibleRef = useRef(true);
+
+  // Track tab visibility to pause polling when hidden
+  useEffect(() => {
+    const handler = () => {
+      visibleRef.current = document.visibilityState === 'visible';
+    };
+    document.addEventListener('visibilitychange', handler);
+    return () => document.removeEventListener('visibilitychange', handler);
+  }, []);
+
+  const unreadQuery = useQuery({
+    queryKey: ['notifications', 'unread-count'],
+    queryFn: async () => {
+      const { data } = await api.get<{ count: number }>('/notifications/unread-count');
+      return data.count;
+    },
+    refetchInterval: () => (visibleRef.current ? 60_000 : false),
+    staleTime: 30_000,
+  });
+
+  const listQuery = useQuery({
+    queryKey: ['notifications', 'list'],
+    queryFn: async () => {
+      const { data } = await api.get<NotificationListResponse>('/notifications', {
+        params: { per_page: 50 },
+      });
+      return data;
+    },
+    staleTime: 30_000,
+  });
+
+  const markReadMutation = useMutation({
+    mutationFn: async (notificationIds: number[]) => {
+      await api.put('/notifications/read', { notification_ids: notificationIds });
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['notifications'] });
+    },
+  });
+
+  const markAllReadMutation = useMutation({
+    mutationFn: async () => {
+      await api.put('/notifications/read-all');
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['notifications'] });
+    },
+  });
+
+  const deleteMutation = useMutation({
+    mutationFn: async (id: number) => {
+      await api.delete(`/notifications/${id}`);
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['notifications'] });
+    },
+  });
+
+  return {
+    unreadCount: unreadQuery.data ?? 0,
+    notifications: listQuery.data?.notifications ?? [],
+    total: listQuery.data?.total ?? 0,
+    isLoading: listQuery.isLoading,
+    markRead: markReadMutation.mutateAsync,
+    markAllRead: markAllReadMutation.mutateAsync,
+    deleteNotification: deleteMutation.mutateAsync,
+  };
+}

frontend/src/types/index.ts

@@ -23,6 +23,25 @@ export interface Settings {
   // Auto-lock settings
   auto_lock_enabled: boolean;
   auto_lock_minutes: number;
+  // Profile fields (shareable)
+  phone: string | null;
+  mobile: string | null;
+  address: string | null;
+  company: string | null;
+  job_title: string | null;
+  // Social settings
+  accept_connections: boolean;
+  // Sharing defaults
+  share_preferred_name: boolean;
+  share_email: boolean;
+  share_phone: boolean;
+  share_mobile: boolean;
+  share_birthday: boolean;
+  share_address: boolean;
+  share_company: boolean;
+  share_job_title: boolean;
+  // ntfy connections toggle
+  ntfy_connections_enabled: boolean;
   created_at: string;
   updated_at: string;
 }
@@ -171,6 +190,9 @@ export interface Person {
   company?: string;
   job_title?: string;
   notes?: string;
+  linked_user_id?: number | null;
+  is_umbral_contact: boolean;
+  shared_fields?: Record<string, unknown> | null;
   created_at: string;
   updated_at: string;
 }
@@ -222,6 +244,7 @@ export type LoginResponse = LoginSuccessResponse | LoginMfaRequiredResponse | Lo
 export interface AdminUser {
   id: number;
   username: string;
+  umbral_name: string;
   email: string | null;
   first_name: string | null;
   last_name: string | null;
@@ -366,3 +389,48 @@ export interface EventTemplate {
   is_starred: boolean;
   created_at: string;
 }
+
+// ── Notifications ──────────────────────────────────────────────────
+// Named AppNotification to avoid collision with browser Notification API
+
+export interface AppNotification {
+  id: number;
+  user_id: number;
+  type: string;
+  title: string | null;
+  message: string | null;
+  data: Record<string, unknown> | null;
+  source_type: string | null;
+  source_id: number | null;
+  is_read: boolean;
+  created_at: string;
+}
+
+export interface NotificationListResponse {
+  notifications: AppNotification[];
+  unread_count: number;
+  total: number;
+}
+
+// ── Connections ────────────────────────────────────────────────────
+
+export interface ConnectionRequest {
+  id: number;
+  sender_umbral_name: string;
+  sender_preferred_name: string | null;
+  status: 'pending' | 'accepted' | 'rejected' | 'cancelled';
+  created_at: string;
+}
+
+export interface Connection {
+  id: number;
+  connected_user_id: number;
+  connected_umbral_name: string;
+  connected_preferred_name: string | null;
+  person_id: number | null;
+  created_at: string;
+}
+
+export interface UmbralSearchResponse {
+  found: boolean;
+}