fix: make trigger paths globally unique

api/alembic/versions/cdcf9f65913b_add_workflow_uuid.py

@@ -0,0 +1,49 @@
+"""add workflow_uuid
+
+Revision ID: cdcf9f65913b
+Revises: a1b2c3d4e5f6
+Create Date: 2026-04-25 18:24:45.954049
+
+"""
+
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = "cdcf9f65913b"
+down_revision: Union[str, None] = "a1b2c3d4e5f6"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # 1. Add the column as nullable so existing rows are accepted.
+    op.add_column(
+        "workflows",
+        sa.Column("workflow_uuid", sa.String(length=36), nullable=True),
+    )
+
+    # 2. Backfill UUIDs for existing rows. gen_random_uuid() is built-in on
+    #    PostgreSQL 13+; cast to text to match the String(36) column type.
+    op.execute(
+        "UPDATE workflows SET workflow_uuid = gen_random_uuid()::text "
+        "WHERE workflow_uuid IS NULL"
+    )
+
+    # 3. Now that every row has a value, enforce NOT NULL.
+    op.alter_column("workflows", "workflow_uuid", nullable=False)
+
+    # 4. Create the unique index.
+    op.create_index(
+        op.f("ix_workflows_workflow_uuid"),
+        "workflows",
+        ["workflow_uuid"],
+        unique=True,
+    )
+
+
+def downgrade() -> None:
+    op.drop_index(op.f("ix_workflows_workflow_uuid"), table_name="workflows")
+    op.drop_column("workflows", "workflow_uuid")