docs(dev): align setup with current stack

deploy/README.md

@@ -65,29 +65,14 @@ EMAIL_FOLLOWUPREMINDERS_UPCOMINGDAYS=2
 SUMMARIZER_BASE_URL=http://ai-service:8001
 ```
 
-## Database recommendation
-For production, yes — use a real database.
+## Supported databases
 
-### Recommended direction
-Short term:
-- SQLite is acceptable for a single-user or very small deployment
-- keep backups and volume persistence
+The application supports only these provider values:
 
-Better production choice:
-- MariaDB or PostgreSQL
+- `sqlite` — local development and small single-instance deployments; persist and back up the data volume.
+- `mariadb` or `mysql` — server deployments through the Pomelo EF Core provider. The production example uses MariaDB.
 
-### My recommendation
-- **PostgreSQL** if you want the best long-term maintainability and fewer edge cases
-- **MariaDB** is also fine if that is what you already know or host elsewhere
-
-If you stay on SQLite:
-- okay for small personal use
-- not ideal for concurrent writes, larger scale, or operational robustness
-
-## Practical recommendation for this project
-If this app is going to be a real production service on Ubuntu:
-- move to PostgreSQL first if possible
-- MariaDB is still a reasonable option if preferred
+PostgreSQL is not implemented. Do not configure or recommend it without first adding an EF Core provider, migrations, startup validation, backup/restore support, and a provider test matrix.
 
 ## Deployment flow
 
@@ -117,7 +102,6 @@ if forwarded-header trust is enabled without a valid known CIDR.
 - confirm AI service container is reachable from backend
 - confirm reminder and admin/system pages load
 - verify follow-up reminder emails are enabled only when intended and that links open the correct job/tab
-hat links open the correct job/tab
 
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