feat(schema): add adapter column to events, drop source

Replaces module-path-based source column (e.g. "central/adapters/nws")
with stable adapter identifier (e.g. "nws") that foreign-keys to
config.adapters.name.

Migration 011:
- ADD COLUMN adapter TEXT
- Backfill via REPLACE(source, 'central/adapters/', '')
- SET NOT NULL + FK RESTRICT
- CREATE INDEX (adapter, received DESC) for dashboard queries
- DROP COLUMN source

Code changes:
- Event model: source field renamed to adapter
- All adapters: use adapter="name" instead of source="central/adapters/name"
- Archive: write adapter column instead of source

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/central/adapters/firms.py

@@ -330,7 +330,7 @@ class FIRMSAdapter(SourceAdapter):
 
         return Event(
             id=stable_id,
-            source="central/adapters/firms",
+            adapter="firms",
             category=f"fire.hotspot.{satellite_short}.{confidence}",
             time=time,
             expires=None,

src/central/adapters/nws.py

@@ -475,7 +475,7 @@ class NWSAdapter(SourceAdapter):
 
         return Event(
             id=event_id,
-            source="central/adapters/nws",
+            adapter="nws",
             category=category,
             time=time,
             expires=expires,

src/central/adapters/usgs_quake.py

@@ -348,7 +348,7 @@ class USGSQuakeAdapter(SourceAdapter):
 
         return Event(
             id=event_id,
-            source="central/adapters/usgs_quake",
+            adapter="usgs_quake",
             category=f"quake.event.{tier}",
             time=event_time,
             expires=None,

src/central/archive.py

@@ -157,7 +157,7 @@ class ArchiveConsumer:
         geo_data = event_data.get("geo")
 
         event_id = envelope.get("id")
-        source = event_data.get("source", "")
+        adapter = event_data.get("adapter", "")
         category = event_data.get("category", "")
         time_str = event_data.get("time")
         expires_str = event_data.get("expires")
@@ -194,12 +194,12 @@ class ArchiveConsumer:
             if geom_json:
                 await conn.execute(
                     """
-                    INSERT INTO events (id, source, category, time, expires, severity,
+                    INSERT INTO events (id, adapter, category, time, expires, severity,
                                        geom, regions, primary_region, payload)
                     VALUES ($1, $2, $3, $4, $5, $6,
                             ST_GeomFromGeoJSON($7), $8, $9, $10)
                     ON CONFLICT (id, time) DO UPDATE SET
-                        source = EXCLUDED.source,
+                        adapter = EXCLUDED.adapter,
                         category = EXCLUDED.category,
                         expires = EXCLUDED.expires,
                         severity = EXCLUDED.severity,
@@ -208,17 +208,17 @@ class ArchiveConsumer:
                         primary_region = EXCLUDED.primary_region,
                         payload = EXCLUDED.payload
                     """,
-                    event_id, source, category, event_time, expires_time, severity,
+                    event_id, adapter, category, event_time, expires_time, severity,
                     geom_json, regions, primary_region, json.dumps(envelope)
                 )
             else:
                 await conn.execute(
                     """
-                    INSERT INTO events (id, source, category, time, expires, severity,
+                    INSERT INTO events (id, adapter, category, time, expires, severity,
                                        geom, regions, primary_region, payload)
                     VALUES ($1, $2, $3, $4, $5, $6, NULL, $7, $8, $9)
                     ON CONFLICT (id, time) DO UPDATE SET
-                        source = EXCLUDED.source,
+                        adapter = EXCLUDED.adapter,
                         category = EXCLUDED.category,
                         expires = EXCLUDED.expires,
                         severity = EXCLUDED.severity,
@@ -227,7 +227,7 @@ class ArchiveConsumer:
                         primary_region = EXCLUDED.primary_region,
                         payload = EXCLUDED.payload
                     """,
-                    event_id, source, category, event_time, expires_time, severity,
+                    event_id, adapter, category, event_time, expires_time, severity,
                     regions, primary_region, json.dumps(envelope)
                 )
 

src/central/models.py

@@ -23,7 +23,7 @@ class Event(BaseModel):
     model_config = ConfigDict(extra="forbid", frozen=True)
 
     id: str  # unique, stable across republish
-    source: str  # adapter identity, e.g. "central/adapters/nws"
+    adapter: str  # adapter identity, e.g. "nws"
     category: str  # e.g. "wx.alert.severe_thunderstorm_warning" or "fire.hotspot.viirs_snpp.high"
     time: datetime  # event-time UTC, not processing-time
     expires: datetime | None = None