Added user login & registration. Added SQL file for postgres database.

backend/nestjs-seshat-api/src/shared/transformers/bigint.ts

@@ -0,0 +1,6 @@
+import { ValueTransformer } from "typeorm";
+
+export const BigIntTransformer: ValueTransformer = {
+  to: (entityValue: bigint) => entityValue.toString(),
+  from: (databaseValue: string): bigint => BigInt(databaseValue),
+};

backend/nestjs-seshat-api/src/shared/transformers/string.ts

@@ -0,0 +1,6 @@
+import { ValueTransformer } from "typeorm";
+
+export const StringToLowerCaseTransformer: ValueTransformer = {
+  to: (entityValue: string) => entityValue.toLowerCase(),
+  from: (databaseValue: string): string => databaseValue,
+};