fix: auto-migrate sightings table to add is_help_event and help_type columns

core/database.py

@@ -63,6 +63,12 @@ class Database:
                     "  created_at DATETIME DEFAULT CURRENT_TIMESTAMP"
                     ");"
                 )
+            # Incremental migrations — safe to run on every startup
+            cols = {row[1] for row in conn.execute("PRAGMA table_info(sightings)").fetchall()}
+            if "is_help_event" not in cols:
+                conn.execute("ALTER TABLE sightings ADD COLUMN is_help_event INTEGER NOT NULL DEFAULT 0")
+            if "help_type" not in cols:
+                conn.execute("ALTER TABLE sightings ADD COLUMN help_type TEXT")
 
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