diff --git a/src/main/router/index.ts b/src/main/router/index.ts
index 8858319..0a7dd94 100644
--- a/src/main/router/index.ts
+++ b/src/main/router/index.ts
@@ -3,7 +3,7 @@ import { z } from 'zod';
 import { eq, asc, inArray, and, or, like, sql } from 'drizzle-orm';
 import { alias } from 'drizzle-orm/sqlite-core';
 import { getDb } from '../db';
-import { clients, projects, tasks } from '../db/schema';
+import { clients, projects, tasks, checkpoints, notes } from '../db/schema';
 import { getStore } from '../store';
 
 const t = initTRPC.create();
@@ -295,7 +295,11 @@ const tasksRouter = router({
 const checkpointsRouter = router({
   list: publicProcedure
     .input(z.object({ projectId: z.string().optional() }).optional())
-    .query(() => []),
+    .query(({ input }) => {
+      const where = input?.projectId !== undefined ? eq(checkpoints.projectId, input.projectId) : undefined;
+      return getDb().select().from(checkpoints).where(where).orderBy(asc(checkpoints.date)).all();
+    }),
+
   create: publicProcedure
     .input(z.object({
       projectId: z.string(),
@@ -304,7 +308,21 @@ const checkpointsRouter = router({
       isAiSuggested: z.number().optional(),
       isApproved: z.number().optional(),
     }))
-    .mutation(() => null),
+    .mutation(({ input }) => {
+      const id = crypto.randomUUID();
+      const now = Date.now();
+      getDb().insert(checkpoints).values({
+        id,
+        projectId: input.projectId,
+        title: input.title,
+        date: input.date,
+        isAiSuggested: input.isAiSuggested ?? 0,
+        isApproved: input.isApproved ?? 0,
+        createdAt: now,
+      }).run();
+      return { id };
+    }),
+
   update: publicProcedure
     .input(z.object({
       id: z.string(),
@@ -312,28 +330,79 @@ const checkpointsRouter = router({
       date: z.number().optional(),
       isApproved: z.number().optional(),
     }))
-    .mutation(() => null),
+    .mutation(({ input }) => {
+      const set: Partial<{ title: string; date: number; isApproved: number }> = {};
+      if (input.title !== undefined) set.title = input.title;
+      if (input.date !== undefined) set.date = input.date;
+      if (input.isApproved !== undefined) set.isApproved = input.isApproved;
+      if (Object.keys(set).length > 0) {
+        getDb().update(checkpoints).set(set).where(eq(checkpoints.id, input.id)).run();
+      }
+      return null;
+    }),
+
   delete: publicProcedure
     .input(z.object({ id: z.string() }))
-    .mutation(() => null),
+    .mutation(({ input }) => {
+      getDb().delete(checkpoints).where(eq(checkpoints.id, input.id)).run();
+      return { success: true as const };
+    }),
 });
 
 const notesRouter = router({
   list: publicProcedure
     .input(z.object({ projectId: z.string().optional() }).optional())
-    .query(() => []),
+    .query(({ input }) => {
+      const where = input?.projectId !== undefined ? eq(notes.projectId, input.projectId) : undefined;
+      return getDb()
+        .select({ id: notes.id, projectId: notes.projectId, title: notes.title, createdAt: notes.createdAt, updatedAt: notes.updatedAt })
+        .from(notes)
+        .where(where)
+        .orderBy(asc(notes.createdAt))
+        .all();
+    }),
+
   get: publicProcedure
     .input(z.object({ id: z.string() }))
-    .query(() => null),
+    .query(({ input }) => {
+      const result = getDb().select().from(notes).where(eq(notes.id, input.id)).all();
+      return result[0] ?? null;
+    }),
+
   create: publicProcedure
     .input(z.object({ title: z.string(), content: z.string(), projectId: z.string().optional() }))
-    .mutation(() => null),
+    .mutation(({ input }) => {
+      const id = crypto.randomUUID();
+      const now = Date.now();
+      getDb().insert(notes).values({
+        id,
+        title: input.title,
+        content: input.content,
+        projectId: input.projectId ?? null,
+        createdAt: now,
+        updatedAt: now,
+      }).run();
+      return { id };
+    }),
+
   update: publicProcedure
     .input(z.object({ id: z.string(), title: z.string().optional(), content: z.string().optional() }))
-    .mutation(() => null),
+    .mutation(({ input }) => {
+      const set: Partial<{ title: string; content: string; updatedAt: number }> = {};
+      if (input.title !== undefined) set.title = input.title;
+      if (input.content !== undefined) set.content = input.content;
+      // Always update updatedAt
+      set.updatedAt = Date.now();
+      getDb().update(notes).set(set).where(eq(notes.id, input.id)).run();
+      return null;
+    }),
+
   delete: publicProcedure
     .input(z.object({ id: z.string() }))
-    .mutation(() => null),
+    .mutation(({ input }) => {
+      getDb().delete(notes).where(eq(notes.id, input.id)).run();
+      return { success: true as const };
+    }),
 });
 
 const settingsRouter = router({