Complete Planner session management (tasks 4.2, 4.6, 4.7) (#9)

docker-compose.dev.yml

@@ -0,0 +1,19 @@
+services:
+  postgres:
+    image: postgis/postgis:16-3.4
+    ports:
+      - "5432:5432"
+    environment:
+      POSTGRES_USER: trails
+      POSTGRES_PASSWORD: trails
+      POSTGRES_DB: trails
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U trails"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+volumes:
+  pgdata: