diff --git a/migrations/versions/7bf4eac76958_add_rule_id_column.py b/migrations/versions/7bf4eac76958_add_rule_id_column.py
index 9a12ccd49..f97545028 100644
--- a/migrations/versions/7bf4eac76958_add_rule_id_column.py
+++ b/migrations/versions/7bf4eac76958_add_rule_id_column.py
@@ -19,14 +19,14 @@
 
 def upgrade():
     # ### commands auto generated by Alembic - please adjust! ###
-    with op.batch_alter_table("cre_links", schema=None) as batch_op:
-        batch_op.drop_constraint("uq_cre_link_pair", type_="unique")
-        batch_op.create_unique_constraint("uq_pair", ["group", "cre"])
-
-    with op.batch_alter_table("cre_node_links", schema=None) as batch_op:
-        batch_op.drop_constraint("uq_cre_node_link_pair", type_="unique")
-        batch_op.create_unique_constraint("uq_pair", ["cre", "node"])
-
+    # NOTE: the original auto-generated diff also renamed the unique constraints
+    # on cre_links (uq_cre_link_pair) and cre_node_links (uq_cre_node_link_pair)
+    # to a shared name "uq_pair". On PostgreSQL a UNIQUE constraint creates a
+    # schema-global index, so two "uq_pair" indexes on two tables collide
+    # ("relation uq_pair already exists") and break a from-empty
+    # `flask db upgrade`. Those renames are removed: the preceding migration
+    # (0d267ae11945) already creates the table-specific constraints and the
+    # models keep those names, so we preserve them here.
     with op.batch_alter_table("node", schema=None) as batch_op:
         batch_op.add_column(sa.Column("section_id", sa.String(), nullable=True))
         batch_op.drop_constraint("uq_node", type_="unique")
@@ -56,12 +56,4 @@ def downgrade():
         )
         batch_op.drop_column("section_id")
 
-    with op.batch_alter_table("cre_node_links", schema=None) as batch_op:
-        batch_op.drop_constraint("uq_pair", type_="unique")
-        batch_op.create_unique_constraint("uq_cre_node_link_pair", ["cre", "node"])
-
-    with op.batch_alter_table("cre_links", schema=None) as batch_op:
-        batch_op.drop_constraint("uq_pair", type_="unique")
-        batch_op.create_unique_constraint("uq_cre_link_pair", ["group", "cre"])
-
     # ### end Alembic commands ###