# Cassandra — app + scheduler + MariaDB + daily backup sidecar.
# .env is mounted read-only; never bake secrets into the image.

services:
  db:
    image: mariadb:11
    restart: unless-stopped
    environment:
      MARIADB_ROOT_PASSWORD: ${MARIADB_ROOT_PASSWORD:-changeme-root}
      MARIADB_DATABASE: ${MARIADB_DATABASE:-cassandra}
      MARIADB_USER: ${MARIADB_USER:-cassandra}
      MARIADB_PASSWORD: ${MARIADB_PASSWORD:-changeme}
    volumes:
      - db-data:/var/lib/mysql
      - ./backup:/backup
    healthcheck:
      test: ["CMD", "healthcheck.sh", "--connect", "--innodb_initialized"]
      interval: 10s
      timeout: 5s
      retries: 10

  redis:
    image: redis:7-alpine
    restart: unless-stopped
    # No volume mount: this is a cache / scratch store. Persistence would
    # undercut the "ephemeral pie" property — survival across restart is a
    # bug, not a feature. AOF/RDB disabled via --save "" --appendonly no.
    command: ["redis-server", "--save", "", "--appendonly", "no",
              "--maxmemory", "128mb", "--maxmemory-policy", "allkeys-lru"]
    healthcheck:
      test: ["CMD", "redis-cli", "ping"]
      interval: 10s
      timeout: 3s
      retries: 5

  app:
    build: .
    restart: unless-stopped
    command: ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000", "--workers", "1"]
    env_file: .env
    environment:
      DATABASE_URL: mysql+aiomysql://${MARIADB_USER:-cassandra}:${MARIADB_PASSWORD:-changeme}@db:3306/${MARIADB_DATABASE:-cassandra}
      REDIS_URL: redis://redis:6379/0
    volumes:
      - ./config:/app/config:ro
    depends_on:
      db:
        condition: service_healthy
      redis:
        condition: service_healthy
    ports:
      - "${CASSANDRA_PORT:-8000}:8000"

  scheduler:
    build: .
    restart: unless-stopped
    command: ["python", "-m", "app.scheduler_main"]
    env_file: .env
    environment:
      DATABASE_URL: mysql+aiomysql://${MARIADB_USER:-cassandra}:${MARIADB_PASSWORD:-changeme}@db:3306/${MARIADB_DATABASE:-cassandra}
      REDIS_URL: redis://redis:6379/0
    volumes:
      - ./config:/app/config:ro
    depends_on:
      db:
        condition: service_healthy
      redis:
        condition: service_healthy

  backup:
    image: mariadb:11
    restart: unless-stopped
    environment:
      MARIADB_HOST: db
      MARIADB_USER: ${MARIADB_USER:-cassandra}
      MARIADB_PASSWORD: ${MARIADB_PASSWORD:-changeme}
      MARIADB_DATABASE: ${MARIADB_DATABASE:-cassandra}
    entrypoint: ["/bin/sh", "-c"]
    # Daily dump at 03:00 UTC; keeps last 14 days.
    command: |
      "while true; do
         sleep $$((86400 - $$(date +%s) % 86400 + 10800));
         f=/backup/cassandra-$$(date -u +%Y-%m-%d).sql.gz;
         echo \"[backup] $$f\";
         mariadb-dump -h $$MARIADB_HOST -u $$MARIADB_USER -p$$MARIADB_PASSWORD $$MARIADB_DATABASE | gzip > $$f || echo '[backup] FAILED';
         find /backup -name 'cassandra-*.sql.gz' -mtime +14 -delete;
       done"
    volumes:
      - ./backup:/backup
    depends_on:
      db:
        condition: service_healthy

volumes:
  db-data: