perf(search): simplify LIKE search (drop LOWER(...) and hence use index)

maybe we need to add `COLLATE NOCASE` to the where clause, idk...

see: Hochfrequenz/xml-fundamend-python#193

Author: hf-kklein

src/server/repository/ahb.ts

@@ -156,17 +156,17 @@ export default class AHBRepository {
           );
         }
         if (value.contains !== undefined) {
-          queryBuilder.andWhere(`LOWER(al.${columnName}) LIKE :${paramBase}_contains`, {
+          queryBuilder.andWhere(`al.${columnName} LIKE :${paramBase}_contains`, {
             [`${paramBase}_contains`]: `%${value.contains.toLowerCase()}%`,
           });
         }
         if (value.startsWith !== undefined) {
-          queryBuilder.andWhere(`LOWER(al.${columnName}) LIKE :${paramBase}_starts`, {
+          queryBuilder.andWhere(`al.${columnName} LIKE :${paramBase}_starts`, {
             [`${paramBase}_starts`]: `${value.startsWith.toLowerCase()}%`,
           });
         }
         if (value.endsWith !== undefined) {
-          queryBuilder.andWhere(`LOWER(al.${columnName}) LIKE :${paramBase}_ends`, {
+          queryBuilder.andWhere(`al.${columnName} LIKE :${paramBase}_ends`, {
             [`${paramBase}_ends`]: `%${value.endsWith.toLowerCase()}`,
           });
         }