chore: add migration to enforce non-nullable 'id' in 'vertex_build' table (#3655)

Add Alembic migration to enforce non-nullable 'id' in 'vertex_build' table

src/backend/base/langflow/alembic/versions/e5a65ecff2cd_nullable_in_vertex_build.py

@@ -0,0 +1,49 @@
+"""nullable in vertex build
+
+Revision ID: e5a65ecff2cd
+Revises: 4522eb831f5c
+Create Date: 2024-09-02 14:55:19.707355
+
+"""
+
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+from sqlalchemy.engine.reflection import Inspector
+
+from langflow.utils import migration
+
+# revision identifiers, used by Alembic.
+revision: str = "e5a65ecff2cd"
+down_revision: Union[str, None] = "4522eb831f5c"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    conn = op.get_bind()
+    # ### commands auto generated by Alembic - please adjust! ###
+    inspector = Inspector.from_engine(conn)  # type: ignore
+    with op.batch_alter_table("vertex_build", schema=None) as batch_op:
+        if migration.column_exists(table_name="vertex_build", column_name="id", conn=conn):
+            columns = inspector.get_columns("vertex_build")
+            id_column = next((column for column in columns if column["name"] == "id"), None)
+            if id_column is not None and id_column["nullable"]:
+                batch_op.alter_column("id", existing_type=sa.VARCHAR(), nullable=False)
+
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    conn = op.get_bind()
+    # ### commands auto generated by Alembic - please adjust! ###
+    inspector = Inspector.from_engine(conn)  # type: ignore
+    with op.batch_alter_table("vertex_build", schema=None) as batch_op:
+        if migration.column_exists(table_name="vertex_build", column_name="id", conn=conn):
+            columns = inspector.get_columns("vertex_build")
+            id_column = next((column for column in columns if column["name"] == "id"), None)
+            if id_column is not None and not id_column["nullable"]:
+                batch_op.alter_column("id", existing_type=sa.VARCHAR(), nullable=True)
+
+    # ### end Alembic commands ###