feat: introduce database as a persistent storage for settings and history

refactor: arrange persistence layer as a port-adapter schema

compose.yaml

@@ -1,5 +1,21 @@
 services:
-  # Bot Discorda wraz z API i panelem webowym serwowanym przez FastAPI.
+  database:
+    image: postgres:17-alpine
+    environment:
+      POSTGRES_DB: ${POSTGRES_DB:-zyrarbot}
+      POSTGRES_USER: ${POSTGRES_USER:-zyrarbot}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-zyrarbot}
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U $${POSTGRES_USER} -d $${POSTGRES_DB}"]
+      interval: 5s
+      timeout: 5s
+      retries: 10
+      start_period: 10s
+    restart: unless-stopped
+    ports:
+      - "5432:5432/tcp"
   discord-bot:
     build:
       context: .
@@ -8,10 +24,21 @@ services:
     environment:
       - DISCORD_TOKEN=${DISCORD_TOKEN}
       - GUILD_ID=${GUILD_ID:-}
+      - POSTGRES_DB=${POSTGRES_DB:-zyrarbot}
+      - POSTGRES_USER=${POSTGRES_USER:-zyrarbot}
+      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD:-zyrarbot}
+      - POSTGRES_HOST=database
+      - POSTGRES_PORT=5432
       - PYTHONUNBUFFERED=1
+    depends_on:
+      database:
+        condition: service_healthy
     volumes:
       - ./config:/app/config
       - ./uploads:/app/uploads
     ports:
       - "80:8000"
     restart: unless-stopped
+
+volumes:
+  postgres_data: