Restructure data model: TrackingConfig + TemplateConfig entities

Major model restructuring for clean separation of concerns:

New entities:
- TrackingConfig: What to react to (event types, asset filters,
  periodic/scheduled/memory mode config) - reusable across targets
- TemplateConfig: All ~15 template slots from blueprint (event
  messages, asset formatting, date/location, scheduled messages)
  with full defaults - separate entities per locale

Changed entities:
- AlbumTracker: Simplified to album selection + polling + target_ids
  (removed event_types, template_id, all filter fields)
- NotificationTarget: Extended with tracking_config_id and
  template_config_id FKs (many-to-one, reusable configs)

Removed entities:
- MessageTemplate (replaced by TemplateConfig)
- ScheduledJob (absorbed into TrackingConfig)

Updated services:
- watcher.py: Each target checked against its own tracking_config
  for event filtering before sending notification
- notifier.py: Uses target's template_config to select the right
  template slot based on event type

New API routes:
- /api/tracking-configs/* (CRUD)
- /api/template-configs/* (CRUD + per-slot preview)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/server/src/immich_watcher_server/services/watcher.py

@@ -22,8 +22,9 @@ from ..database.models import (
     AlbumTracker,
     EventLog,
     ImmichServer,
-    MessageTemplate,
     NotificationTarget,
+    TemplateConfig,
+    TrackingConfig,
 )
 from .notifier import send_notification
 
@@ -58,9 +59,7 @@ async def check_tracker_with_session(
     # Eagerly read all needed data before entering aiohttp context
     # (SQLAlchemy async greenlet context doesn't survive across other async CMs)
     album_ids = list(tracker.album_ids)
-    event_types = list(tracker.event_types)
     target_ids = list(tracker.target_ids)
-    template_id = tracker.template_id
     tracker_db_id = tracker_id
     server_url = server.url
     server_api_key = server.api_key
@@ -69,14 +68,13 @@ async def check_tracker_with_session(
     async with aiohttp.ClientSession() as http_session:
         client = ImmichClient(http_session, server_url, server_api_key)
 
-        # Fetch server config for external domain
         await client.get_server_config()
         users_cache = await client.get_users()
 
         for album_id in album_ids:
             result = await _check_album(
                 session, http_session, client, tracker_db_id,
-                album_id, users_cache, event_types, target_ids, template_id,
+                album_id, users_cache, target_ids,
             )
             results.append(result)
 
@@ -91,9 +89,7 @@ async def _check_album(
     tracker_id: int,
     album_id: str,
     users_cache: dict[str, str],
-    event_types: list[str],
     target_ids: list[int],
-    template_id: int | None,
 ) -> dict[str, Any]:
     """Check a single album for changes."""
     try:
@@ -157,10 +153,6 @@ async def _check_album(
     if change is None:
         return {"album_id": album_id, "status": "no_changes"}
 
-    # Check if this event type is tracked
-    if change.change_type not in event_types and "changed" not in event_types:
-        return {"album_id": album_id, "status": "filtered", "change_type": change.change_type}
-
     # Log the event
     shared_links = await client.get_shared_links(album_id)
     event_data = _build_event_data(change, album, client.external_url, shared_links)
@@ -174,19 +166,41 @@ async def _check_album(
     )
     session.add(event_log)
 
-    # Send notifications to all configured targets
+    # Send notifications to each target, filtered by its tracking config
     for target_id in target_ids:
         target = await session.get(NotificationTarget, target_id)
         if not target:
             continue
 
-        template = None
-        if template_id:
-            template = await session.get(MessageTemplate, template_id)
+        # Check target's tracking config for event filtering
+        tracking_config = None
+        if target.tracking_config_id:
+            tracking_config = await session.get(TrackingConfig, target.tracking_config_id)
+
+        if tracking_config:
+            # Filter by event type
+            should_notify = False
+            if change.change_type == "assets_added" and tracking_config.track_assets_added:
+                should_notify = True
+            elif change.change_type == "assets_removed" and tracking_config.track_assets_removed:
+                should_notify = True
+            elif change.change_type == "album_renamed" and tracking_config.track_album_renamed:
+                should_notify = True
+            elif change.change_type == "album_deleted" and tracking_config.track_album_deleted:
+                should_notify = True
+            elif change.change_type == "changed":
+                should_notify = True  # "changed" = mixed, always notify
+            if not should_notify:
+                continue
+
+        # Get target's template config
+        template_config = None
+        if target.template_config_id:
+            template_config = await session.get(TemplateConfig, target.template_config_id)
 
         try:
             use_ai = target.config.get("ai_captions", False)
-            await send_notification(target, event_data, template, use_ai_caption=use_ai)
+            await send_notification(target, event_data, template_config, use_ai_caption=use_ai)
         except Exception:
             _LOGGER.exception("Failed to send notification to target %d", target_id)