feat: implement robust database migration via new entrypoint script with retry logic

backend/Dockerfile

@@ -17,11 +17,11 @@ RUN pip install --no-cache-dir -r requirements.txt
 # Copy application code
 COPY . .
 
-# Migrate database
-RUN alembic upgrade head
-
 # Expose port
 EXPOSE 8000
 
+# Use the entrypoint so migrations run before CMD
+ENTRYPOINT ["/app/entrypoint.sh"]
+
 # Run the application
 CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000", "--reload"]

backend/entrymigrate.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+set -e
+
+MAX_RETRIES=10
+COUNT=0
+
+echo "Waiting for DB and running alembic migrations..."
+until alembic upgrade head; do
+  COUNT=$((COUNT+1))
+  if [ "$COUNT" -ge "$MAX_RETRIES" ]; then
+    echo "Alembic migrations failed after $COUNT attempts." >&2
+    exit 1
+  fi
+  echo "Alembic failed, retrying in 3s... ($COUNT/$MAX_RETRIES)"
+  sleep 3
+done
+
+echo "Migrations applied."
+exec "$@"

docker-compose.yml

@@ -50,7 +50,7 @@ services:
       piston:
         condition: service_started
     restart: unless-stopped
-
+  
   # Next.js frontend
   frontend:
     build: