chore: switch to all-SQLite stack (drop Postgres service)

.devcontainer/docker-compose.yml

@@ -19,26 +19,8 @@ services:
       - "8000:8000" # FastAPI
       - "3000:3000" # Vite
 
-  db:
-    image: postgres:16-trixie
-    env_file:
-      - ../.env
-    volumes:
-      - postgres-data:/var/lib/postgresql/data
-      - ./init-db.sql:/docker-entrypoint-initdb.d/init-db.sql:ro
-    ports:
-      - "5432:5432"
-    healthcheck:
-      test: ["CMD-SHELL", "pg_isready -U postgres"]
-      interval: 5s
-      timeout: 3s
-      retries: 10
-
   langflow:
-    image: langflowai/langflow:1.12.0
-    depends_on:
-      db:
-        condition: service_healthy
+    image: langflowai/langflow:latest
     env_file:
       - ../.env
     environment:
@@ -49,6 +31,9 @@ services:
       PORT: "7860"
       LANGFLOW_AUTO_LOGIN: "false"
       LANGFLOW_API_KEY_SOURCE: env
+      # SQLite file inside the langflow-data volume (absolute path required
+      # by Langflow); overrides any postgres URL in ../.env.
+      LANGFLOW_DATABASE_URL: sqlite:////app/langflow/langflow.db
     volumes:
       - langflow-data:/app/langflow
     ports:
@@ -85,9 +70,23 @@ services:
       retries: 12
       start_period: 30s
 
+  # Optional nightly auto-updates of :latest images. Not part of the default
+  # dev startup (no container updates needed while iterating).
+  watchtower:
+    image: nickfedor/watchtower:latest
+    profiles: ["updates"]
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+    environment:
+      WATCHTOWER_LABEL_ENABLE: "true"
+      WATCHTOWER_SCHEDULE: "0 0 4 * * *"
+      WATCHTOWER_CLEANUP: "true"
+      WATCHTOWER_ROLLING_RESTART: "true"
+    labels:
+      com.centurylinklabs.watchtower.enable: "true"
+
 volumes:
   kirche-einfach-venv:
   kirche-einfach-node-modules:
-  postgres-data:
   langflow-data:
-  lfx-data:
+  lfx-data: