feat: add Docker migration service

README.md

@@ -10,6 +10,7 @@ A web application to manage pet pictures from subscribers. Built with Flask, SQL
 - Modern, responsive UI using Tailwind CSS
 - Click to view full-size images
 - Download original images
+- Add descriptions to pet pictures
 
 ## Setup
 
@@ -29,6 +30,26 @@ python main.py
 
 The application will be available at `http://localhost:5000`
 
+### Database Migration
+
+#### Local Migration
+
+If you have an existing database and want to add the description field:
+
+```bash
+python migrate.py
+```
+
+#### Docker Migration
+
+To run the migration in Docker:
+
+```bash
+docker compose --profile migrate up migrate
+```
+
+This will safely add the description column to your existing database without affecting existing data.
+
 ### Docker Deployment
 
 #### Using Docker Compose (Recommended)
@@ -73,14 +94,16 @@ The application will be available at `http://localhost:54321`
 1. Visit the homepage to see all uploaded pet pictures
 2. Click "Upload New" to add a new pet picture
 3. Fill in the subscriber name and select a picture
-4. View uploaded pictures on the homepage
-5. Click on any picture to view it in full size
-6. Use the "Download Original" button to download the original file
-7. Mark pictures as posted using the "Mark as Posted" button
+4. Add an optional description for the pet picture
+5. View uploaded pictures on the homepage
+6. Click on any picture to view it in full size
+7. Use the "Download Original" button to download the original file
+8. Mark pictures as posted using the "Mark as Posted" button
 
 ## File Structure
 
 - `main.py` - Main Flask application
+- `migrate.py` - Database migration script
 - `templates/` - Jinja2 templates
   - `base.html` - Base template with common layout
   - `index.html` - Homepage with picture grid

docker-compose.yml

@@ -11,11 +11,31 @@ services:
     environment:
       - FLASK_APP=main.py
       - FLASK_ENV=production
-      - GUNICORN_CMD_ARGS=--workers=4 --bind=0.0.0.0:5000 --timeout=120
+      - GUNICORN_CMD_ARGS=--workers=4 --bind=0.0.0.0:5000 --timeout=120 --keep-alive=5 --worker-class=sync --worker-connections=1000 --max-requests=1000 --max-requests-jitter=50
     restart: unless-stopped
     healthcheck:
-      test: ["CMD", "curl", "-f", "http://localhost:5000"]
+      test:
+        [
+          "CMD",
+          "curl",
+          "-f",
+          "http://localhost:5000/",
+          "--connect-timeout",
+          "5",
+          "--retry",
+          "3",
+          "--retry-delay",
+          "5",
+        ]
       interval: 30s
       timeout: 10s
       retries: 3
       start_period: 40s
+
+  migrate:
+    build: .
+    volumes:
+      - ./pet_pictures.db:/app/pet_pictures.db
+    command: python migrate.py
+    profiles:
+      - migrate