Add SQLAlchemy and database boilerplate code

tofu_api/dependencies.py

@@ -0,0 +1,24 @@
+from sqlalchemy.orm import Session
+
+from tofu_api.common.database import SQLAlchemy
+
+
+class Dependencies:
+    """
+    Container for dependency injection.
+    """
+
+    _dependency_cache: dict
+
+    def __init__(self):
+        self._dependency_cache = {}
+
+    # Database dependencies
+
+    def get_sqlalchemy(self) -> SQLAlchemy:
+        if SQLAlchemy not in self._dependency_cache:
+            self._dependency_cache[SQLAlchemy] = SQLAlchemy()
+        return self._dependency_cache[SQLAlchemy]
+
+    def get_db_session(self) -> Session:
+        return self.get_sqlalchemy().session