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+# Repository Guidelines
+
+## Project Structure & Module Organization
+- `src/` – app code
+  - `components/` (React, PascalCase files), `pages/` (Astro/API routes), `lib/` (domain + utilities, kebab-case), `hooks/`, `layouts/`, `styles/`, `tests/`, `types/`, `data/`, `content/`.
+- `scripts/` – operational TS scripts (DB init, recovery): e.g., `scripts/manage-db.ts`.
+- `drizzle/` – SQL migrations; `data/` – runtime SQLite (`gitea-mirror.db`).
+- `public/` – static assets; `dist/` – build output.
+- Key config: `astro.config.mjs`, `tsconfig.json` (alias `@/* → src/*`), `bunfig.toml` (test preload), `.env(.example)`.
+
+## Build, Test, and Development Commands
+- Prereq: Bun `>= 1.2.9` (see `package.json`).
+- Setup: `bun run setup` – install deps and init DB.
+- Dev: `bun run dev` – start Astro dev server.
+- Build: `bun run build` – produce `dist/`.
+- Preview/Start: `bun run preview` (static preview) or `bun run start` (SSR entry).
+- Database: `bun run db:generate|migrate|push|studio` and `bun run manage-db init|check|fix|reset-users`.
+- Tests: `bun test` | `bun run test:watch` | `bun run test:coverage`.
+- Docker: see `docker-compose.yml` and variants in repo root.
+
+## Coding Style & Naming Conventions
+- Language: TypeScript, Astro, React.
+- Indentation: 2 spaces; keep existing semicolon/quote style in touched files.
+- Components: PascalCase `.tsx` in `src/components/` (e.g., `MainLayout.tsx`).
+- Modules/utils: kebab-case in `src/lib/` (e.g., `gitea-enhanced.ts`).
+- Imports: prefer alias `@/…` (configured in `tsconfig.json`).
+- Do not introduce new lint/format configs; follow current patterns.
+
+## Testing Guidelines
+- Runner: Bun test (`bun:test`) with preload `src/tests/setup.bun.ts` (see `bunfig.toml`).
+- Location/Names: `**/*.test.ts(x)` under `src/**` (examples in `src/lib/**`).
+- Scope: add unit tests for new logic and API route tests for handlers.
+- Aim for meaningful coverage on DB, auth, and mirroring paths.
+
+## Commit & Pull Request Guidelines
+- Commits: short, imperative, scoped when helpful (e.g., `lib: fix token parsing`, `ui: align buttons`).
+- PRs must include:
+  - Summary, rationale, and testing steps/commands.
+  - Linked issues (e.g., `Closes #123`).
+  - Screenshots/gifs for UI changes.
+  - Notes on DB/migration or .env impacts; update `docs/`/CHANGELOG if applicable.
+
+## Security & Configuration Tips
+- Never commit secrets. Copy `.env.example` → `.env` and fill values; prefer `bun run startup-env-config` to validate.
+- SQLite files live in `data/`; avoid committing generated DBs.
+- Certificates (if used) reside in `certs/`; manage locally or via Docker secrets.