fix(backend): Workaround MikroORM syntax error

backend/src/data/dwengo-entity-repository.ts

@@ -1,12 +1,25 @@
-import { EntityRepository, FilterQuery } from '@mikro-orm/core';
+import { EntityRepository, FilterQuery, SyntaxErrorException } from '@mikro-orm/core';
 import { EntityAlreadyExistsException } from '../exceptions/entity-already-exists-exception.js';
+import { getLogger } from '../logging/initalize.js';
 
 export abstract class DwengoEntityRepository<T extends object> extends EntityRepository<T> {
     public async save(entity: T, options?: { preventOverwrite?: boolean }): Promise<void> {
         if (options?.preventOverwrite && (await this.findOne(entity))) {
             throw new EntityAlreadyExistsException(`A ${this.getEntityName()} with this identifier already exists.`);
         }
-        await this.getEntityManager().persistAndFlush(entity);
+        try {
+            await this.getEntityManager().persistAndFlush(entity);
+        } catch (e: unknown) {
+            // Workaround for MikroORM bug: Sometimes, queries are generated with random syntax errors.
+            // The faulty query is then retried everytime something is persisted. By clearing the entity
+            // Manager in that case, we make sure that future queries will work.
+            if (e instanceof SyntaxErrorException) {
+                getLogger().error("SyntaxErrorException caught => entity manager cleared.");
+                this.em.clear();
+            } else {
+                throw e;
+            }
+        }
     }
     public async deleteWhere(query: FilterQuery<T>): Promise<void> {
         const toDelete = await this.findOne(query);