# cloudband-solutions/default_api_fast architecture

> Architecture diagram of the GitHub repository cloudband-solutions/default_api_fast, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-10-01). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/cloudband-solutions/default_api_fast
- Repository: https://github.com/cloudband-solutions/default_api_fast

## Overview

This FastAPI starter provides an API workflow from HTTP routes through controller, authentication/operation, and persistence or file storage layers. Its main user-facing capabilities are login, admin-managed user CRUD, uploads, and health checks; it also includes database configuration and migrations plus app-specific CLI routines. The graph preserves those documented capabilities, while omitting unverified implementation details for unsampled modules. The README documents PostgreSQL/SQLite and optional S3; the upload storage implementation also shows local filesystem and S3 behavior.

Main entry points: [`app/routes.py`](https://github.com/cloudband-solutions/default_api_fast/blob/master/app/routes.py) (Route registry), [`app/controllers/system_controller.py`](https://github.com/cloudband-solutions/default_api_fast/blob/master/app/controllers/system_controller.py) (Login endpoint), [`app/controllers/users_controller.py`](https://github.com/cloudband-solutions/default_api_fast/blob/master/app/controllers/users_controller.py) (User endpoints), [`app/operations/users/save.py`](https://github.com/cloudband-solutions/default_api_fast/blob/master/app/operations/users/save.py) (User save operation)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_api["API surface"]
  node_routes["Route registry<br/>[routes.py]"]
  node_health["Health endpoint"]
  node_login_controller["Login endpoint"]
  node_users_controller["User endpoints"]
  node_uploads_controller["Upload endpoints"]
  node_system_schema["Login schemas<br/>[system.py]"]
  node_user_schema["User schemas<br/>[user.py]"]
  node_upload_schema["Upload schemas<br/>[upload.py]"]
end

subgraph group_domain["Domain operations"]
  node_auth["Admin authorization<br/>[auth.py]"]
  node_login["Login operation<br/>[login.py]"]
  node_user_save["User save operation<br/>[save.py]"]
  node_validator["Operation validation<br/>[validator.py]"]
  node_api_helpers["JWT and passwords<br/>[api_helpers.py]"]
end

subgraph group_platform["Runtime platform"]
  node_app_factory["Application factory<br/>[__init__.py]"]
  node_environment["Environment settings<br/>[environment.py]"]
  node_config["Configuration loader<br/>[config.py]"]
  node_cli["App CLI<br/>[cli.py]"]
end

subgraph group_persistence["Persistence and storage"]
  node_user_model["User model<br/>[user.py]"]
  node_database["Database manager<br/>[db.py]"]
  node_db_service[("SQL database")]
  node_migrations["Schema migrations"]
  node_storage["File storage<br/>[storage.py]"]
  node_filesystem[("Local filesystem")]
  node_s3[("S3 service")]
end

node_client(("API client"))

node_client -->|"sends requests"| node_routes
node_routes -->|"registers"| node_health
node_routes -->|"registers"| node_login_controller
node_routes -->|"registers"| node_users_controller
node_routes -->|"registers"| node_uploads_controller
node_login_controller -->|"uses"| node_system_schema
node_users_controller -->|"uses"| node_user_schema
node_uploads_controller -->|"uses"| node_upload_schema
node_users_controller -->|"requires admin"| node_auth
node_users_controller -->|"executes"| node_user_save
node_login_controller -->|"executes"| node_login
node_login_controller -->|"generates token"| node_api_helpers
node_login -->|"checks password"| node_api_helpers
node_login -->|"queries"| node_user_model
node_login -->|"inherits"| node_validator
node_user_save -->|"hashes password"| node_api_helpers
node_user_save -->|"creates or updates"| node_user_model
node_user_save -->|"inherits"| node_validator
node_auth -->|"decodes token"| node_api_helpers
node_auth -->|"loads user"| node_user_model
node_user_model -->|"uses base"| node_database
node_users_controller -->|"queries and commits"| node_database
node_login_controller -->|"gets session"| node_database
node_database -->|"connects"| node_db_service
node_migrations -->|"updates schema"| node_db_service
node_uploads_controller -->|"stores or serves"| node_storage
node_storage -->|"writes or reads"| node_filesystem
node_storage -.->|"uploads objects"| node_s3
node_app_factory -->|"registers routes"| node_routes
node_app_factory -->|"loads settings"| node_environment
node_config -->|"uses"| node_environment
node_cli -->|"runs database routines"| node_database
node_cli -->|"loads configuration"| node_config
node_cli -->|"seeds users"| node_user_save

click node_routes "https://github.com/cloudband-solutions/default_api_fast/blob/master/app/routes.py"
click node_health "https://github.com/cloudband-solutions/default_api_fast/blob/master/app/controllers/health_controller.py"
click node_login_controller "https://github.com/cloudband-solutions/default_api_fast/blob/master/app/controllers/system_controller.py"
click node_users_controller "https://github.com/cloudband-solutions/default_api_fast/blob/master/app/controllers/users_controller.py"
click node_uploads_controller "https://github.com/cloudband-solutions/default_api_fast/blob/master/app/controllers/uploads_controller.py"
click node_system_schema "https://github.com/cloudband-solutions/default_api_fast/blob/master/app/schemas/system.py"
click node_user_schema "https://github.com/cloudband-solutions/default_api_fast/blob/master/app/schemas/user.py"
click node_upload_schema "https://github.com/cloudband-solutions/default_api_fast/blob/master/app/schemas/upload.py"
click node_auth "https://github.com/cloudband-solutions/default_api_fast/blob/master/app/dependencies/auth.py"
click node_login "https://github.com/cloudband-solutions/default_api_fast/blob/master/app/operations/system/login.py"
click node_user_save "https://github.com/cloudband-solutions/default_api_fast/blob/master/app/operations/users/save.py"
click node_validator "https://github.com/cloudband-solutions/default_api_fast/blob/master/app/operations/validator.py"
click node_api_helpers "https://github.com/cloudband-solutions/default_api_fast/blob/master/app/helpers/api_helpers.py"
click node_user_model "https://github.com/cloudband-solutions/default_api_fast/blob/master/app/models/user.py"
click node_database "https://github.com/cloudband-solutions/default_api_fast/blob/master/app/db.py"
click node_migrations "https://github.com/cloudband-solutions/default_api_fast/tree/master/alembic/versions"
click node_storage "https://github.com/cloudband-solutions/default_api_fast/blob/master/app/storage.py"
click node_app_factory "https://github.com/cloudband-solutions/default_api_fast/blob/master/app/__init__.py"
click node_environment "https://github.com/cloudband-solutions/default_api_fast/blob/master/app/environment.py"
click node_config "https://github.com/cloudband-solutions/default_api_fast/blob/master/config.py"
click node_cli "https://github.com/cloudband-solutions/default_api_fast/blob/master/app/cli.py"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_routes,node_health,node_login_controller,node_users_controller,node_uploads_controller,node_system_schema,node_user_schema,node_upload_schema,node_client toneBlue
class node_auth,node_login,node_user_save,node_validator,node_api_helpers toneAmber
class node_app_factory,node_environment,node_config,node_cli toneMint
class node_user_model,node_database,node_db_service,node_migrations,node_storage,node_filesystem,node_s3 toneRose
```

## Components

### API surface

- [Route registry](https://github.com/cloudband-solutions/default_api_fast/blob/master/app/routes.py): `app/routes.py`
- [Health endpoint](https://github.com/cloudband-solutions/default_api_fast/blob/master/app/controllers/health_controller.py): `app/controllers/health_controller.py`
- [Login endpoint](https://github.com/cloudband-solutions/default_api_fast/blob/master/app/controllers/system_controller.py): `app/controllers/system_controller.py`
- [User endpoints](https://github.com/cloudband-solutions/default_api_fast/blob/master/app/controllers/users_controller.py): `app/controllers/users_controller.py`
- [Upload endpoints](https://github.com/cloudband-solutions/default_api_fast/blob/master/app/controllers/uploads_controller.py): `app/controllers/uploads_controller.py`
- [Login schemas](https://github.com/cloudband-solutions/default_api_fast/blob/master/app/schemas/system.py): `app/schemas/system.py`
- [User schemas](https://github.com/cloudband-solutions/default_api_fast/blob/master/app/schemas/user.py): `app/schemas/user.py`
- [Upload schemas](https://github.com/cloudband-solutions/default_api_fast/blob/master/app/schemas/upload.py): `app/schemas/upload.py`

### Domain operations

- [Admin authorization](https://github.com/cloudband-solutions/default_api_fast/blob/master/app/dependencies/auth.py): `app/dependencies/auth.py`
- [Login operation](https://github.com/cloudband-solutions/default_api_fast/blob/master/app/operations/system/login.py): `app/operations/system/login.py`
- [User save operation](https://github.com/cloudband-solutions/default_api_fast/blob/master/app/operations/users/save.py): `app/operations/users/save.py`
- [Operation validation](https://github.com/cloudband-solutions/default_api_fast/blob/master/app/operations/validator.py): `app/operations/validator.py`
- [JWT and passwords](https://github.com/cloudband-solutions/default_api_fast/blob/master/app/helpers/api_helpers.py): `app/helpers/api_helpers.py`

### Runtime platform

- [Application factory](https://github.com/cloudband-solutions/default_api_fast/blob/master/app/__init__.py): `app/__init__.py`
- [Environment settings](https://github.com/cloudband-solutions/default_api_fast/blob/master/app/environment.py): `app/environment.py`
- [Configuration loader](https://github.com/cloudband-solutions/default_api_fast/blob/master/config.py): `config.py`
- [App CLI](https://github.com/cloudband-solutions/default_api_fast/blob/master/app/cli.py): `app/cli.py`

### Persistence and storage

- [User model](https://github.com/cloudband-solutions/default_api_fast/blob/master/app/models/user.py): `app/models/user.py`
- [Database manager](https://github.com/cloudband-solutions/default_api_fast/blob/master/app/db.py): `app/db.py`
- **SQL database**
- [Schema migrations](https://github.com/cloudband-solutions/default_api_fast/tree/master/alembic/versions): `alembic/versions`
- [File storage](https://github.com/cloudband-solutions/default_api_fast/blob/master/app/storage.py): `app/storage.py`
- **Local filesystem**
- **S3 service**

### Other components

- **API client**

## Connections

- API client → Route registry: sends requests (evidence: `README.md`)
- Route registry → Health endpoint: registers (evidence: `app/routes.py`)
- Route registry → Login endpoint: registers (evidence: `app/routes.py`)
- Route registry → User endpoints: registers (evidence: `app/routes.py`)
- Route registry → Upload endpoints: registers (evidence: `app/routes.py`)
- Login endpoint → Login schemas: uses (evidence: `app/controllers/system_controller.py`)
- User endpoints → User schemas: uses (evidence: `app/controllers/users_controller.py`)
- Upload endpoints → Upload schemas: uses (evidence: `app/controllers/uploads_controller.py`)
- User endpoints → Admin authorization: requires admin (evidence: `app/controllers/users_controller.py`)
- User endpoints → User save operation: executes (evidence: `app/controllers/users_controller.py`)
- Login endpoint → Login operation: executes (evidence: `app/controllers/system_controller.py`)
- Login endpoint → JWT and passwords: generates token (evidence: `app/controllers/system_controller.py`)
- Login operation → JWT and passwords: checks password (evidence: `app/operations/system/login.py`)
- Login operation → User model: queries (evidence: `app/operations/system/login.py`)
- Login operation → Operation validation: inherits (evidence: `app/operations/system/login.py`)
- User save operation → JWT and passwords: hashes password (evidence: `app/operations/users/save.py`)
- User save operation → User model: creates or updates (evidence: `app/operations/users/save.py`)
- User save operation → Operation validation: inherits (evidence: `app/operations/users/save.py`)
- Admin authorization → JWT and passwords: decodes token (evidence: `app/dependencies/auth.py`)
- Admin authorization → User model: loads user (evidence: `app/dependencies/auth.py`)
- User model → Database manager: uses base (evidence: `app/models/user.py`)
- User endpoints → Database manager: queries and commits (evidence: `app/controllers/users_controller.py`)
- Login endpoint → Database manager: gets session (evidence: `app/controllers/system_controller.py`)
- Database manager → SQL database: connects (evidence: `README.md`)
- Schema migrations → SQL database: updates schema (evidence: `README.md`)
- Upload endpoints → File storage: stores or serves (evidence: `app/controllers/uploads_controller.py`)
- File storage → Local filesystem: writes or reads (evidence: `app/storage.py`)
- File storage → S3 service: uploads objects (evidence: `app/storage.py`)
- Application factory → Route registry: registers routes (evidence: `app/__init__.py`)
- Application factory → Environment settings: loads settings (evidence: `app/__init__.py`)
- Configuration loader → Environment settings: uses (evidence: `config.py`)
- App CLI → Database manager: runs database routines (evidence: `app/cli.py`)
- App CLI → Configuration loader: loads configuration (evidence: `app/cli.py`)
- App CLI → User save operation: seeds users (evidence: `app/cli.py`)