Fix double CREATE TYPE crashes + oversized revision id in moderation migration

0001_initial.py: restore create_type=False on the two inline ENUM column
declarations (world_visibility, asset_type) -- this task's own auto-checkpoint
had accidentally reverted the 2026-08-18 fix (PR #25) while working on an
unrelated file.

0003_add_moderation_tables_and_user_roles.py: same bug pattern, self-inflicted
this time -- added create_type=False to all 8 inline column ENUM declarations
(user_role, target_type x2, reason_category, report_status, resolution,
action_type, appeal_status). Also shortened the revision id from
0003_add_moderation_tables_and_user_roles (42 chars) to 0003_moderation_schema
(23 chars) -- alembic_version.version_num is VARCHAR(32) by default, so the
migration ran to completion and then failed writing its own bookkeeping row.

Verified against a genuinely fresh Postgres container: full chain
(0001 -> 0002 -> 0003) now runs clean, all 8 tables land.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

backend/alembic/versions/0001_initial.py

@@ -69,7 +69,8 @@ def upgrade() -> None:
         sa.Column(
             "visibility",
             postgresql.ENUM(
-                "public", "private", "friends_only", name="world_visibility"
+                "public", "private", "friends_only", name="world_visibility",
+                create_type=False,
             ),
             nullable=True,
         ),
@@ -89,7 +90,7 @@ def upgrade() -> None:
             "asset_type",
             postgresql.ENUM(
                 "image", "audio", "video", "document", "model_3d", "other",
-                name="asset_type",
+                name="asset_type", create_type=False,
             ),
             nullable=False,
         ),

backend/alembic/versions/0003_add_moderation_tables_and_user_roles.py

@@ -1,6 +1,6 @@
 """add moderation tables and user roles
 
-Revision ID: 0003_add_moderation_tables_and_user_roles
+Revision ID: 0003_moderation_schema
 Revises: 0002_add_date_of_birth_to_users
 Create Date: 2025-01-02 00:00:00.000000
 
@@ -11,8 +11,12 @@ from alembic import op
 import sqlalchemy as sa
 from sqlalchemy.dialects import postgresql
 
-# revision identifiers, used by Alembic.
+# revision identifiers, used by Alembic. Kept short deliberately: alembic's
-revision: str = "0003_add_moderation_tables_and_user_roles"
+# own alembic_version.version_num column is VARCHAR(32) by default, and the
+# original "0003_add_moderation_tables_and_user_roles" (42 chars) exceeded
+# it -- migration ran to completion and then failed writing its own version
+# bookkeeping row. Verified 2026-08-19 against a genuinely fresh database.
+revision: str = "0003_moderation_schema"
 down_revision: Union[str, None] = "0002_add_date_of_birth_to_users"
 branch_labels: Union[str, Sequence[str], None] = None
 depends_on: Union[str, Sequence[str], None] = None
@@ -69,7 +73,7 @@ def upgrade() -> None:
         "users",
         sa.Column(
             "role",
-            postgresql.ENUM("user", "moderator", "admin", name="user_role"),
+            postgresql.ENUM("user", "moderator", "admin", name="user_role", create_type=False),
             nullable=False,
             server_default="user",
         ),
@@ -86,7 +90,7 @@ def upgrade() -> None:
         sa.Column(
             "target_type",
             postgresql.ENUM(
-                "user", "world", "asset", "chat_message", name="target_type"
+                "user", "world", "asset", "chat_message", name="target_type", create_type=False,
             ),
             nullable=False,
         ),
@@ -102,6 +106,7 @@ def upgrade() -> None:
                 "self_harm",
                 "other",
                 name="reason_category",
+                create_type=False,
             ),
             nullable=False,
         ),
@@ -109,7 +114,7 @@ def upgrade() -> None:
         sa.Column(
             "status",
             postgresql.ENUM(
-                "open", "in_review", "resolved", "dismissed", name="report_status"
+                "open", "in_review", "resolved", "dismissed", name="report_status", create_type=False,
             ),
             nullable=False,
             server_default="open",
@@ -118,7 +123,7 @@ def upgrade() -> None:
         sa.Column(
             "resolution",
             postgresql.ENUM(
-                "action_taken", "dismissed", "no_violation", name="resolution"
+                "action_taken", "dismissed", "no_violation", name="resolution", create_type=False,
             ),
             nullable=True,
         ),
@@ -154,7 +159,7 @@ def upgrade() -> None:
         sa.Column(
             "target_type",
             postgresql.ENUM(
-                "user", "world", "asset", "chat_message", name="target_type"
+                "user", "world", "asset", "chat_message", name="target_type", create_type=False,
             ),
             nullable=False,
         ),
@@ -163,7 +168,7 @@ def upgrade() -> None:
             "action",
             postgresql.ENUM(
                 "warn", "suspend", "ban", "restrict", "remove", "restore",
-                name="action_type",
+                name="action_type", create_type=False,
             ),
             nullable=False,
         ),
@@ -209,7 +214,7 @@ def upgrade() -> None:
         sa.Column(
             "status",
             postgresql.ENUM(
-                "pending", "approved", "rejected", name="appeal_status"
+                "pending", "approved", "rejected", name="appeal_status", create_type=False,
             ),
             nullable=False,
             server_default="pending",