Add table construction, adding commits, and commit checking queries. Modify Commit model properties & table.

models.py

@@ -5,13 +5,12 @@ from datetime import datetime
 @dataclass
 class Commit:
     """Describes a specific commit event in time."""
-
-    # A unique identifier for this commit. Not necessarily the commit hash.
-    id: int
-    # A name, description etc. for this commit. Not required to be based on the original comit message.
-    name: str
-    # A timestamp
+    id: str
+    project_id: int
+    source: str
+    iteration: int
     timestamp: datetime
+    seen_timestamp: datetime
 
     def __str__(self) -> str:
         return '{name}({params})'.format(