feat: Implement comprehensive database schema with new models, CRUD operations, and documentation for host metrics, Docker management, and terminal sessions, while removing old test files.

app/core/config.py

@@ -75,6 +75,9 @@ class Settings(BaseSettings):
     jwt_algorithm: str = "HS256"
 
     # === Database ===
+    db_engine: str = Field(
+        default_factory=lambda: os.environ.get("DB_ENGINE", "sqlite")
+    )
     database_url: Optional[str] = Field(default=None)
     
     @property
@@ -85,13 +88,21 @@ class Settings(BaseSettings):
         return f"sqlite+aiosqlite:///{self.db_path}"
 
     # === CORS ===
-    cors_origins: list = Field(
+    cors_origins: str | list = Field(
         default_factory=lambda: [
             o.strip() for o in os.environ.get(
                 "CORS_ORIGINS", "http://localhost:3000,http://localhost:8008"
             ).split(",") if o.strip()
         ]
     )
+    
+    @field_validator("cors_origins", mode="before")
+    @classmethod
+    def assemble_cors_origins(cls, v: object) -> list[str]:
+        if isinstance(v, str):
+            return [i.strip() for i in v.split(",") if i.strip()]
+        return v
+        
     cors_allow_credentials: bool = True
     cors_allow_methods: list = Field(default=["*"])
     cors_allow_headers: list = Field(default=["*"])