diff --git a/web/src/padelnomics/migrations/versions/0021_add_performance_indexes.py b/web/src/padelnomics/migrations/versions/0021_add_performance_indexes.py
new file mode 100644
index 0000000..98e4772
--- /dev/null
+++ b/web/src/padelnomics/migrations/versions/0021_add_performance_indexes.py
@@ -0,0 +1,41 @@
+"""Add missing indexes identified in performance review.
+
+Columns used in WHERE clauses across admin and worker routes that
+lacked indexes and would cause full table scans as the tables grow.
+"""
+
+
+def up(conn) -> None:
+    # lead_requests: filtered by lead_type, status, verified_at, country
+    conn.execute(
+        "CREATE INDEX IF NOT EXISTS idx_lead_requests_lead_type"
+        " ON lead_requests(lead_type)"
+    )
+    conn.execute(
+        "CREATE INDEX IF NOT EXISTS idx_lead_requests_type_status"
+        " ON lead_requests(lead_type, status)"
+    )
+    conn.execute(
+        "CREATE INDEX IF NOT EXISTS idx_lead_requests_type_verified"
+        " ON lead_requests(lead_type, verified_at)"
+    )
+    conn.execute(
+        "CREATE INDEX IF NOT EXISTS idx_lead_requests_country"
+        " ON lead_requests(country)"
+    )
+
+    # suppliers: filtered by tier and claimed_by in admin list + worker refill
+    conn.execute(
+        "CREATE INDEX IF NOT EXISTS idx_suppliers_tier"
+        " ON suppliers(tier)"
+    )
+    conn.execute(
+        "CREATE INDEX IF NOT EXISTS idx_suppliers_claimed_by"
+        " ON suppliers(claimed_by)"
+    )
+
+    # credit_ledger: balance queries sum delta grouped by supplier_id
+    conn.execute(
+        "CREATE INDEX IF NOT EXISTS idx_credit_ledger_supplier"
+        " ON credit_ledger(supplier_id)"
+    )