Migrate to PostgreSQL and add Config Status page

MIGRATION.md

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+# Database Migration Guide
+
+This guide outlines the offline workflow to migrate your `meal_planner` data from SQLite to PostgreSQL.
+
+## Prerequisites
+- Docker Compose installed.
+- The application running (or capable of running) via `docker-compose`.
+
+## Migration Steps
+
+### 1. Backup your SQLite Database
+First, create a safety copy of your current database.
+```bash
+cp data/meal_planner.db meal_planner_backup.db
+```
+
+### 2. Stop the Application
+Stop the running application container to ensure no new data is written.
+```bash
+docker-compose stop foodtracker
+```
+
+### 3. Start PostgreSQL
+Ensure the new PostgreSQL service is running.
+```bash
+docker-compose up -d postgres
+```
+
+### 4. Run the Migration
+Use a temporary container to run the migration script. We mount your backup file and connect to the postgres service.
+```bash
+# Syntax: python migrate_to_postgres.py --sqlite-path <path_to_db> --pg-url <postgres_url>
+
+docker-compose run --rm \
+  -v $(pwd)/meal_planner_backup.db:/backup.db \
+  -v $(pwd)/migrate_to_postgres.py:/app/migrate_to_postgres.py \
+  foodtracker \
+  python migrate_to_postgres.py \
+  --sqlite-path /backup.db \
+  --pg-url postgresql://user:password@postgres/meal_planner
+```
+
+### 5. Update Configuration
+Edit `docker-compose.yml` to switch the active database.
+1. Comment out the SQLite `DATABASE_URL`.
+2. Uncomment the PostgreSQL `DATABASE_URL`.
+
+```yaml
+    environment:
+      # - DATABASE_URL=sqlite:////app/data/meal_planner.db
+      - DATABASE_URL=postgresql://user:password@postgres/meal_planner
+```
+
+### 6. Restart the Application
+Rebuild and start the application to use the new database.
+```bash
+docker-compose up -d --build foodtracker
+```
+
+## Verification
+1. Log in to the application.
+2. Verify your Foods, Meals, and Plans are present.
+3. Check `docker logs foodplanner-foodtracker-1` to ensure no database connection errors.