Implement BaseModel class, TimestampMixin, TzDateTime type; cleanup Task model

tofu_api/common/json/json_encoder.py

@@ -0,0 +1,29 @@
+from datetime import datetime
+from typing import Any
+
+from flask.json import JSONEncoder as _FlaskJSONEncoder
+
+__all__ = [
+    'JSONEncoder',
+]
+
+
+class JSONEncoder(_FlaskJSONEncoder):
+    """
+    Custom JSON encoder built on top of the Flask JSONEncoder class.
+    """
+
+    def default(self, obj: Any) -> Any:
+        """
+        Convert any object to a JSON serializable type.
+        """
+        # Convert datetimes to ISO format without microseconds (e.g. '2022-01-02T10:20:30+00:00')
+        if isinstance(obj, datetime):
+            return obj.isoformat(timespec='seconds')
+
+        # Use to_dict() method on objects that have it
+        if hasattr(obj, 'to_dict'):
+            return obj.to_dict()
+
+        # Fallback to the Flask JSONEncoder
+        return super().default(obj)