flowchart LR
  U[Browser\nNext.js] -->|HTTP JSON| B[Drogon API\nC++]
  B -->|SQLite| DB[(csp.db)]

  subgraph Backend Modules
    C1[Controllers\n/auth, /health] --> S1[Services\nAuthService]
    S1 --> R1[DB Layer\nSqliteDb + migrations]
  end