Chore: set schema_version default value directly in the pydantic model (#1652)

* Chore: set schema_version default value directly in the pydantic model

* Set defaults in Versions

Author: georgesittas

sqlmesh/core/state_sync/base.py

@@ -35,9 +35,9 @@
 class Versions(PydanticModel):
     """Represents the various versions of dependencies in the state sync."""
 
-    schema_version: int
-    sqlglot_version: str
-    sqlmesh_version: str
+    schema_version: int = 0
+    sqlglot_version: str = "0.0.0"
+    sqlmesh_version: str = "0.0.0"
 
     @property
     def minor_sqlglot_version(self) -> t.Tuple[int, int]:

sqlmesh/core/state_sync/engine_adapter.py

@@ -471,7 +471,7 @@ def _get_snapshots_with_same_version(
         return [Snapshot(**json.loads(row[0])) for row in snapshot_rows]
 
     def _get_versions(self, lock_for_update: bool = False) -> Versions:
-        no_version = Versions(schema_version=0, sqlglot_version="0.0.0", sqlmesh_version="0.0.0")
+        no_version = Versions()
 
         if not self.engine_adapter.table_exists(self.versions_table):
             return no_version
@@ -485,9 +485,7 @@ def _get_versions(self, lock_for_update: bool = False) -> Versions:
             return no_version
 
         return Versions(
-            schema_version=row[0],
-            sqlglot_version=row[1],
-            sqlmesh_version=seq_get(row, 2) or "0.0.0",
+            schema_version=row[0], sqlglot_version=row[1], sqlmesh_version=seq_get(row, 2)
         )
 
     def _get_environment(