feat: ( payment ) create payment microservice

apps/edr-payment-api/src/config/database.config.ts

@@ -0,0 +1,36 @@
+import { registerAs } from "@nestjs/config";
+import { TypeOrmModuleOptions } from "@nestjs/typeorm";
+import { DataSourceOptions } from "typeorm";
+
+/**
+ * Shared connection options for the Nest TypeORM module and the standalone DataSource
+ * (migration CLI). Payment tables live in the SAME Postgres database as the domain system
+ * (edr_database by default) but in the dedicated `edr_payment` schema; logical ownership is
+ * enforced with a dedicated DB user in non-dev environments (grants only on this schema).
+ */
+export function buildDataSourceOptions(): DataSourceOptions {
+  return {
+    type: "postgres",
+    host: process.env.DB_HOST ?? "localhost",
+    port: parseInt(process.env.DB_PORT ?? "5432", 10),
+    username: process.env.DB_USER ?? "edr",
+    password: process.env.DB_PASSWORD ?? "",
+    database: process.env.DB_NAME ?? "edr_database",
+    schema: process.env.DB_SCHEMA ?? "edr_payment",
+    entities: [__dirname + "/../**/*.entity.{ts,js}"],
+    migrations: [__dirname + "/../migrations/*.{ts,js}"],
+    // Schema changes go through migrations only — never synchronize (house rule).
+    synchronize: false,
+    logging: process.env.NODE_ENV === "development",
+  };
+}
+
+export default registerAs(
+  "database",
+  (): TypeOrmModuleOptions => ({
+    ...buildDataSourceOptions(),
+    autoLoadEntities: true,
+    // Run pending migrations on boot (main.ts ensures the database/schema exist first).
+    migrationsRun: true,
+  }),
+);