Fix TypeScript type errors across multiple files

src/lib/db.ts

@@ -5,7 +5,7 @@ export const KAFKA = 'kafka';
 export const KAFKA_PRODUCER = 'kafka-producer';
 
 // Fixes issue with converting bigint values
-BigInt.prototype.toJSON = function () {
+(BigInt.prototype as any).toJSON = function () {
   return Number(this);
 };