feat(omg): backfill omg_entries from all projects with job_number

All CC Dashboard projects that have a non-empty job_number now appear
in the OMG list automatically. Existing entries are preserved (INSERT
only where no entry with that job_number exists for the user).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

alembic/versions/0012_backfill_omg_from_projects.py

@@ -0,0 +1,39 @@
+"""Backfill omg_entries from all projects that have a job_number
+
+Revision ID: 0012
+Revises: 0011
+Create Date: 2026-05-18
+"""
+from alembic import op
+
+revision = "0012"
+down_revision = "0011"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.execute(
+        """
+        INSERT INTO omg_entries (id, user_id, name, client, job_number, notes)
+        SELECT
+            gen_random_uuid()::text,
+            p.user_id,
+            p.display_name,
+            p.client,
+            p.job_number,
+            ''
+        FROM projects p
+        WHERE p.job_number IS NOT NULL
+          AND p.job_number != ''
+          AND NOT EXISTS (
+              SELECT 1 FROM omg_entries o
+              WHERE o.user_id = p.user_id
+                AND o.job_number = p.job_number
+          )
+        """
+    )
+
+
+def downgrade() -> None:
+    pass