refactor: update Clerk authentication integration and improve organization handling

backend/migrations/versions/a1e6b0d62f0c_drop_org_name_unique.py

@@ -0,0 +1,31 @@
+"""Allow duplicate organization names.
+
+Revision ID: a1e6b0d62f0c
+Revises: 658dca8f4a11
+Create Date: 2026-02-09 00:00:00.000000
+
+"""
+
+from __future__ import annotations
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "a1e6b0d62f0c"
+down_revision = "658dca8f4a11"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    """Drop global unique constraint on organization names."""
+    op.drop_constraint("uq_organizations_name", "organizations", type_="unique")
+
+
+def downgrade() -> None:
+    """Restore global unique constraint on organization names."""
+    op.create_unique_constraint(
+        "uq_organizations_name",
+        "organizations",
+        ["name"],
+    )