- Add hasStudentConflict() to Appointment model
- Check student conflicts in store() and update()
- Returns 409 Conflict when student has overlapping appointment
- Fixed PostgreSQL sequence for appointments id
- Move JWT_SECRET from hardcode to .env (security)
- Add hasInstructorConflict() to Appointment model
- Add conflict check in store() and update() — returns 409
- Add .env.example with placeholder
- Add API documentation (README.md)
- Add deploy_api.sh script
- api.fahrschultermin.de: full API entry point with CORS + session auth
- fahrschultermin.de: frontend only, no more /api/v1 routing
- Database.php: PostgreSQL support (pgsql driver + lastval())
- All repositories: use Database::lastInsertId() for PG compatibility
- config/app.php: PostgreSQL connection settings + CORS config
- bootstrap.php: pass full $config to Database::configure()
- public/index.php: fetch-patch to redirect /api/v1 to api.fahrschultermin.de
- database/schema_pgsql.sql: full PostgreSQL schema (BIGSERIAL)
- database/import_pgsql.sql: 518 rows migrated from SQLite
