/status/data endpoint fixes.

manager/db.py

@@ -71,7 +71,7 @@ def init_db():
             agent_id TEXT NOT NULL,
             interface_name TEXT NOT NULL,
             mac_address TEXT,
-            addresses_json TEXT,
+            addresses_json TEXT NOT NULL DEFAULT '[]',
             is_virtual INTEGER NOT NULL DEFAULT 0,
             vpn_type TEXT,
             last_seen_at INTEGER NOT NULL,
@@ -92,6 +92,13 @@ def init_db():
         CREATE INDEX IF NOT EXISTS idx_alarms_agent_status ON alarms(agent_id, status);
     """)
     conn.commit()
+
+    # Migration: backfill any NULL addresses_json from before the NOT NULL default
+    conn.execute("""
+        UPDATE agent_interfaces SET addresses_json = '[]'
+        WHERE addresses_json IS NULL
+    """)
+    conn.commit()
     logger.info("Database initialized at %s", DB_PATH)