minor tweaks

src/singerlake/store/manifest.py

@@ -3,13 +3,20 @@
 from pydantic import BaseModel
 
 
+class SchemaVersion(BaseModel):
+    """Schema Version."""
+
+    first_observed: str
+    schema_hash: str
+
+
 class StreamManifest(BaseModel):
     """Stream Manifest."""
 
     stream_id: str
 
     files: t.List[str] = []
-    versions: t.Mapping[str, str] = {}
+    versions: t.List[SchemaVersion] = []
 
 
 class TapManifest(BaseModel):

src/singerlake/store/path_manager/base.py

@@ -150,10 +150,7 @@ def get_record_partitions(
         ]
         return tuple(partitions)
 
-    def format_partition(self, partition: Partition) -> str:
-        """Format a partition."""
-        return str(partition.value)
-
+    @t.final
     def hash_stream_schema(self, stream_schema: t.Mapping[str, t.Any]) -> str:
         """Calculate a unique short-hash for given schema."""
         data = json.dumps(stream_schema, sort_keys=True)
@@ -195,3 +192,7 @@ def transform(self, path: GenericPath) -> t.Any:
         Override to transform GenericPath to a different path type.
         """
         return self.transformer.transform(path)
+
+    def format_partition(self, partition: Partition) -> str:
+        """Format a partition."""
+        return str(partition.value)