Add db & pydantic models + set up alembic

backend/app/config.py

@@ -0,0 +1,41 @@
+import secrets
+import warnings
+from typing import Annotated, Any, Literal
+from pydantic import (
+    MySQLDsn
+)
+from pydantic_core import MultiHostUrl
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    """
+    """
+    model_config = SettingsConfigDict(
+        # One level above ./backend
+        env_file='../.env',
+        env_ignore_empty=True,
+        extra='ignore'
+    )
+    SECRET_KEY: str = secrets.token_urlsafe(32)
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = 60 * 24 * 8 # 8 days
+
+    MYSQL_SERVER: str
+    MYSQL_PORT: int = 3306
+    MYSQL_USER: str
+    MYSQL_PASSWORD: str = ""
+    MYSQL_DB: str = ""
+
+    @computed_field # type: ignore[prop-decorator]
+    @property
+    def SQLALCHEMY_DATABASE_URI(self) -> MySQLDsn:
+        return MultiHostUrl.build(
+            scheme="mysql+mysqldb",
+            username=self.MYSQL_USER,
+            password=self.MYSQL_PASSWORD,
+            host=self.MYSQL_SERVER,
+            port=self.MYSQL_PORT,
+            path=self.MYSQL_DB
+        ) # type: ignore
+
+settings = Settings() # type: ignore