chore: change draft var to user scoped (#33066)

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: QuantumGhost <obelisk.reg+git@gmail.com>

api/migrations/versions/2026_03_04_1600-6b5f9f8b1a2c_add_user_id_to_workflow_draft_variables.py

@@ -0,0 +1,69 @@
+"""add user_id and switch workflow_draft_variables unique key to user scope
+
+Revision ID: 6b5f9f8b1a2c
+Revises: 0ec65df55790
+Create Date: 2026-03-04 16:00:00.000000
+
+"""
+
+import sqlalchemy as sa
+from alembic import op
+
+import models as models
+
+# revision identifiers, used by Alembic.
+revision = "6b5f9f8b1a2c"
+down_revision = "0ec65df55790"
+branch_labels = None
+depends_on = None
+
+
+def _is_pg(conn) -> bool:
+    return conn.dialect.name == "postgresql"
+
+
+def upgrade():
+    conn = op.get_bind()
+    table_name = "workflow_draft_variables"
+
+    with op.batch_alter_table(table_name, schema=None) as batch_op:
+        batch_op.add_column(sa.Column("user_id", models.types.StringUUID(), nullable=True))
+
+    if _is_pg(conn):
+        with op.get_context().autocommit_block():
+            op.create_index(
+                "workflow_draft_variables_app_id_user_id_key",
+                "workflow_draft_variables",
+                ["app_id", "user_id", "node_id", "name"],
+                unique=True,
+                postgresql_concurrently=True,
+            )
+    else:
+        op.create_index(
+            "workflow_draft_variables_app_id_user_id_key",
+            "workflow_draft_variables",
+            ["app_id", "user_id", "node_id", "name"],
+            unique=True,
+        )
+
+    with op.batch_alter_table(table_name, schema=None) as batch_op:
+        batch_op.drop_constraint(op.f("workflow_draft_variables_app_id_key"), type_="unique")
+
+
+def downgrade():
+    conn = op.get_bind()
+
+    with op.batch_alter_table("workflow_draft_variables", schema=None) as batch_op:
+        batch_op.create_unique_constraint(
+            op.f("workflow_draft_variables_app_id_key"),
+            ["app_id", "node_id", "name"],
+        )
+
+    if _is_pg(conn):
+        with op.get_context().autocommit_block():
+            op.drop_index("workflow_draft_variables_app_id_user_id_key", postgresql_concurrently=True)
+    else:
+        op.drop_index("workflow_draft_variables_app_id_user_id_key", table_name="workflow_draft_variables")
+
+    with op.batch_alter_table("workflow_draft_variables", schema=None) as batch_op:
+        batch_op.drop_column("user_id")