diff --git a/import-custom-sql.sh b/import-custom-sql.sh
index ee090af39..ca2fe0370 100644
--- a/import-custom-sql.sh
+++ b/import-custom-sql.sh
@@ -184,6 +184,16 @@ import_store_sql() {
         return 0
     fi
 
+    # Store.sql is a one-time bootstrap, not a repeatable migration. It
+    # contains UPDATE and DELETE statements that would overwrite values
+    # maintained in the live store database. The canonical services table is
+    # created by the initial bootstrap, so its presence also protects
+    # installations created before this guard was introduced.
+    if database_exists "store" && table_exists "store" "store_services"; then
+        log "store database already initialized, skipping one-time Store.sql bootstrap"
+        return 0
+    fi
+
     if ! database_exists "store"; then
         log "creating database store"
         mysql_exec "" "CREATE DATABASE IF NOT EXISTS \`store\` CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;"