Update README: document sqlc instead of GORM

README.md

@@ -13,7 +13,7 @@ A self-sufficient web application to manage an ISPmail (Postfix, Dovecot, Rspamd
 
 ## Tech Stack
 
-- **Backend**: Go with Gin framework, GORM for database
+- **Backend**: Go with Gin framework, sqlc for type-safe SQL
 - **Frontend**: SvelteKit
 - **Database**: MariaDB/MySQL (shared with mail server ISPmail schema)
 - **Auth**: JWT-based authentication
@@ -40,7 +40,9 @@ imc-vibe/
 │       │   └── handlers/  # HTTP handlers
 │       ├── auth/           # JWT authentication
 │       ├── config/         # Configuration loading
-│       ├── db/             # Database models and operations
+│       ├── db/             # Database access layer
+│       │   ├── queries/   # SQL query files (sqlc source)
+│       │   └── sqlc/      # Generated type-safe Go code
 │       └── mail/          # Mail server integration (postqueue, logs, quota)
 ├── frontend/               # SvelteKit frontend
 │   ├── src/
@@ -121,6 +123,26 @@ The app creates these tables automatically:
 
 Existing ISPmail tables (`virtual_domains`, `virtual_users`, `virtual_aliases`) are used for mail data.
 
+### Database Access with sqlc
+
+The app uses [sqlc](https://sqlc.dev/) for type-safe database access:
+
+- SQL queries are defined in `backend/internal/db/queries/*.sql`
+- Type-safe Go code is generated with `sqlc generate` into `backend/internal/db/sqlc/`
+- **Do not edit files in `sqlc/`** - they are regenerated from queries
+
+To regenerate after changing queries:
+
+```bash
+cd backend && sqlc generate
+```
+
+Enable SQL query logging in development:
+
+```bash
+USE_EMBEDDED=false ./build/imc
+```
+
 ## Systemd Service
 
 Example service file at `/etc/systemd/system/imc.service`:
@@ -151,6 +173,7 @@ WantedBy=multi-user.target
 
 - Go 1.21+
 - Bun (for frontend development)
+- sqlc (for database code generation)
 - MariaDB/MySQL
 - Postfix (with postqueue/postsuper)
 - systemd-journald (for log viewing)