introduce TRPC and service layer

lib/services/notes.service.ts

@@ -0,0 +1,29 @@
+import { PrismaClient } from '@prisma/client';
+
+export default class NotesService {
+  private prisma: PrismaClient;
+
+  constructor( prisma: PrismaClient) {
+    this.prisma = prisma;
+  }
+
+  async getAllNotes() {
+    return this.prisma.note.findMany();
+  }
+
+  async getNotesForAccountId(account_id: number) {
+    return this.prisma.note.findMany({ where: { account_id } });
+  }
+
+  async createNote( account_id: number, note_text: string ) {
+    return this.prisma.note.create({ data: { account_id, note_text }});
+  }
+
+  async updateNote(id: number, note_text: string) {
+    return this.prisma.note.update({ where: { id }, data: { note_text } });
+  }
+
+  async deleteNote(id: number) {
+    return this.prisma.note.delete({ where: { id } });
+  }
+}