feat: lock concurrent moderation decisions

apps/api/alembic/versions/0015_moderation_version.py

@@ -0,0 +1,22 @@
+"""add optimistic moderation versions
+
+Revision ID: 0015
+Revises: 0014
+"""
+from alembic import op
+import sqlalchemy as sa
+
+revision = "0015"
+down_revision = "0014"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.add_column("catch_report", sa.Column("moderation_version", sa.Integer(), nullable=False, server_default="0"))
+    op.add_column("external_observation", sa.Column("moderation_version", sa.Integer(), nullable=False, server_default="0"))
+
+
+def downgrade() -> None:
+    op.drop_column("external_observation", "moderation_version")
+    op.drop_column("catch_report", "moderation_version")