Preliminary sqlite db setup

src/db.ts

@@ -1,18 +1,76 @@
-import { createPentagon, z } from '@/deps.ts';
-import { hexIdSchema } from '@/schema.ts';
+import { Sqlite } from '@/deps.ts';
 
-const kv = await Deno.openKv();
+interface User {
+  pubkey: string;
+  username: string;
+  inserted_at: Date;
+}
 
-const userSchema = z.object({
-  pubkey: hexIdSchema.describe('primary'),
-  username: z.string().regex(/^\w{1,30}$/).describe('unique'),
-  createdAt: z.date(),
-});
+class DittoDB {
+  #db: Sqlite;
 
-const db = createPentagon(kv, {
-  users: {
-    schema: userSchema,
-  },
-});
+  constructor(db: Sqlite) {
+    this.#db = db;
 
+    this.#db.execute(`
+      CREATE TABLE events (
+        id TEXT PRIMARY KEY,
+        kind INTEGER NOT NULL,
+        pubkey TEXT NOT NULL,
+        content TEXT NOT NULL,
+        created_at INTEGER NOT NULL,
+        tags TEXT NOT NULL,
+        sig TEXT NOT NULL
+      );
+      
+      CREATE INDEX idx_events_kind ON events(kind);
+      CREATE INDEX idx_events_pubkey ON events(pubkey);
+      
+      CREATE TABLE tags (
+        tag TEXT NOT NULL,
+        value_1 TEXT,
+        value_2 TEXT,
+        value_3 TEXT,
+        event_id TEXT NOT NULL,
+        FOREIGN KEY(event_id) REFERENCES events(id) ON DELETE CASCADE
+      );
+      
+      CREATE INDEX idx_tags_tag ON tags(tag);
+      CREATE INDEX idx_tags_value_1 ON tags(value_1);
+      CREATE INDEX idx_tags_event_id ON tags(event_id);
+      
+      CREATE TABLE users (
+        pubkey TEXT PRIMARY KEY,
+        username TEXT NOT NULL,
+        inserted_at DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL
+      );
+
+      CREATE UNIQUE INDEX idx_users_username ON users(username);
+    `);
+  }
+
+  insertUser(user: Pick<User, 'pubkey' | 'username'>): void {
+    this.#db.query(
+      'INSERT INTO users(pubkey, username) VALUES (?, ?)',
+      [user.pubkey, user.username],
+    );
+  }
+
+  getUserByUsername(username: string): User | null {
+    const result = this.#db.query<[string, string, Date]>(
+      'SELECT pubkey, username, inserted_at FROM users WHERE username = ?',
+      [username],
+    )[0];
+    if (!result) return null;
+    return {
+      pubkey: result[0],
+      username: result[1],
+      inserted_at: result[2],
+    };
+  }
+}
+
+const db = new DittoDB(
+  new Sqlite('data/db.sqlite3'),
+);
 export { db };