Changes for refactor of references view, add unique keys for some tables

References sites table updated so we can filter by site later, added
timestamp to tunes so they can be sorted in certain contexts, enforced
uniqueness on some tables that were causing issues

migrations/versions/c3f8a1e924d5_add_created_at_to_tunes.py

@@ -0,0 +1,29 @@
+"""add created_at to tunes
+
+Revision ID: c3f8a1e924d5
+Revises: 57326830536b
+Create Date: 2026-06-09
+"""
+from alembic import op
+import sqlalchemy as sa
+
+revision = "c3f8a1e924d5"
+down_revision = "57326830536b"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        "tunes",
+        sa.Column(
+            "created_at",
+            sa.DateTime(timezone=True),
+            server_default=sa.text("now()"),
+            nullable=True,
+        ),
+    )
+
+
+def downgrade() -> None:
+    op.drop_column("tunes", "created_at")