fix(phase-35): rewrite migration to avoid SQLAlchemy enum auto-create

Replace sa.Enum column types with raw SQL DO $$ IF NOT EXISTS blocks
for enum creation, then sa.Text columns + ALTER TYPE USING casts.
This completely bypasses SQLAlchemy's _on_table_create hook that
triggers CREATE TYPE without checkfirst, causing DuplicateObject
on PostgreSQL when the entrypoint retries after a failed migration.

backend/alembic/versions/b020_add_jira_links_and_worklogs.py

@@ -19,36 +19,29 @@ depends_on: Union[str, Sequence[str], None] = None
 
 
 def upgrade() -> None:
-    # ── Enums — create once, then reference with create_type=False ───
+    # ── Enums via raw SQL to avoid any SQLAlchemy auto-create hooks ───
-    jira_link_entity_type = sa.Enum(
+    op.execute("""
-        "test", "technique", "campaign", "evidence",
+        DO $$ BEGIN
-        name="jiralinkentitytype",
+            IF NOT EXISTS (SELECT 1 FROM pg_type WHERE typname = 'jiralinkentitytype') THEN
-    )
+                CREATE TYPE jiralinkentitytype AS ENUM ('test', 'technique', 'campaign', 'evidence');
-    jira_sync_direction = sa.Enum(
+            END IF;
-        "aegis_to_jira", "jira_to_aegis", "bidirectional",
+        END $$
-        name="jirasyncdirection",
+    """)
-    )
+    op.execute("""
-    jira_link_entity_type.create(op.get_bind(), checkfirst=True)
+        DO $$ BEGIN
-    jira_sync_direction.create(op.get_bind(), checkfirst=True)
+            IF NOT EXISTS (SELECT 1 FROM pg_type WHERE typname = 'jirasyncdirection') THEN
+                CREATE TYPE jirasyncdirection AS ENUM ('aegis_to_jira', 'jira_to_aegis', 'bidirectional');
+            END IF;
+        END $$
+    """)
 
-    # Re-reference with create_type=False so create_table won't try to
+    # Use sa.String for column types — the actual PG column will use the
-    # CREATE TYPE again (which causes DuplicateObject on PostgreSQL).
+    # enum type via explicit USING casts below.  This completely avoids
-    entity_type_col = sa.Enum(
+    # SQLAlchemy's _on_table_create hook that causes DuplicateObject.
-        "test", "technique", "campaign", "evidence",
-        name="jiralinkentitytype",
-        create_type=False,
-    )
-    sync_dir_col = sa.Enum(
-        "aegis_to_jira", "jira_to_aegis", "bidirectional",
-        name="jirasyncdirection",
-        create_type=False,
-    )
-
-    # ── jira_links table ─────────────────────────────────────────────
     op.create_table(
         "jira_links",
         sa.Column("id", postgresql.UUID(as_uuid=True), primary_key=True),
-        sa.Column("entity_type", entity_type_col, nullable=False),
+        sa.Column("entity_type", sa.Text, nullable=False),
         sa.Column("entity_id", postgresql.UUID(as_uuid=True), nullable=False),
         sa.Column("jira_issue_key", sa.String(50), nullable=False),
         sa.Column("jira_issue_id", sa.String(50)),
@@ -57,13 +50,18 @@ def upgrade() -> None:
         sa.Column("jira_priority", sa.String(50)),
         sa.Column("jira_assignee", sa.String(255)),
         sa.Column("jira_story_points", sa.String(10)),
-        sa.Column("sync_direction", sync_dir_col, server_default="bidirectional"),
+        sa.Column("sync_direction", sa.Text, server_default="bidirectional"),
         sa.Column("last_synced_at", sa.DateTime),
         sa.Column("sync_metadata", postgresql.JSONB, server_default="{}"),
         sa.Column("created_by", postgresql.UUID(as_uuid=True), sa.ForeignKey("users.id")),
         sa.Column("created_at", sa.DateTime, server_default=sa.func.now()),
         sa.Column("updated_at", sa.DateTime, server_default=sa.func.now()),
     )
+
+    # Now ALTER the columns to use the actual enum types
+    op.execute("ALTER TABLE jira_links ALTER COLUMN entity_type TYPE jiralinkentitytype USING entity_type::jiralinkentitytype")
+    op.execute("ALTER TABLE jira_links ALTER COLUMN sync_direction TYPE jirasyncdirection USING sync_direction::jirasyncdirection")
+
     op.create_index("ix_jira_links_entity_id", "jira_links", ["entity_id"])
     op.create_index("ix_jira_links_issue_key", "jira_links", ["jira_issue_key"])
     op.create_index(
@@ -102,5 +100,5 @@ def upgrade() -> None:
 def downgrade() -> None:
     op.drop_table("worklogs")
     op.drop_table("jira_links")
-    sa.Enum(name="jirasyncdirection").drop(op.get_bind(), checkfirst=True)
+    op.execute("DROP TYPE IF EXISTS jirasyncdirection")
-    sa.Enum(name="jiralinkentitytype").drop(op.get_bind(), checkfirst=True)
+    op.execute("DROP TYPE IF EXISTS jiralinkentitytype")