Pool sensor v2: VCC monitoring, database resilience, receiver improvements

- Added voltage monitoring table and storage pipeline
- Extended pool payload to 17 bytes with VCC field (protocol v2)
- Improved database connection pool resilience (reduced pool size, aggressive recycling, pool disposal on failure)
- Added environment variable support for database configuration
- Fixed receiver MQTT deprecation warning (CallbackAPIVersion.VERSION2)
- Silenced excessive RSSI status logging in receiver
- Added reset flag tracking and reporting
- Updated Docker compose with DB config and log rotation limits

docker-compose.yml

@@ -10,6 +10,12 @@ services:
       - SSH_KEY_PATH=/workspace/.ssh/id_rsa
       - STALL_WINDOW_SECONDS=${STALL_WINDOW_SECONDS:-300}
       - RESTART_COOLDOWN_SECONDS=${RESTART_COOLDOWN_SECONDS:-3600}
+      - DB_HOST=${DB_HOST:-192.168.43.102}
+      - DB_PORT=${DB_PORT:-3306}
+      - DB_USER=${DB_USER:-weatherdata}
+      - DB_PASSWORD=${DB_PASSWORD:-cfCUswMHfK82!}
+      - DB_NAME=${DB_NAME:-weatherdata}
+      - DB_CONNECT_TIMEOUT=${DB_CONNECT_TIMEOUT:-5}
     volumes:
       - /volume1/docker/weatherstation:/workspace
       - /volume1/docker/weatherstation/data:/workspace/data
@@ -17,6 +23,11 @@ services:
       - /volume1/docker/weatherstation/secrets/known_hosts:/workspace/.ssh/known_hosts:ro
     restart: unless-stopped
     command: python datacollector.py
+    logging:
+      driver: json-file
+      options:
+        max-size: "5m"
+        max-file: "3"
     networks:
       - data-net
     stdin_open: true