automatically run migrations

src/db/db.ts

@@ -1,8 +1,38 @@
+import fs from "node:fs";
 import { PrismaClient } from "@prisma/client";
+import { execSync } from "node:child_process";
 
+// ensure db exists
+if(!fs.existsSync("./data/mydb.sqlite")) {
+    // run bun prisma migrate deploy with child_process
+    console.log("Database not found, creating a new one...");
+    execSync("bun prisma migrate deploy");
+}
+
+// The db version before we switched to Prisma
 const prisma = new PrismaClient();
+const legacyVersion = await prisma.$queryRaw<{ user_version: bigint }[]>`PRAGMA user_version;`;
+if (legacyVersion[0]?.user_version === 1n) {
+    // close prisma connection
+    await prisma.$disconnect();
+    // Existing legacy database found, needs migration
+    console.log("Legacy database found. Skipping initial migration...");
+    execSync("bun prisma migrate resolve --applied 0_init");
+    // reconnect prisma
+    await prisma.$connect();
+    // set user_version to 2
+    await prisma.$executeRaw`PRAGMA user_version = 2;`;
+}
 
-// Initialize the database schema using Prisma migrations instead of raw SQL.
-// Ensure to run `npx prisma migrate dev` to apply the schema changes.
+console.log("Running database migrations...");
+
+// run any pending migrations
+await prisma.$disconnect();
+execSync("bun prisma migrate deploy");
+await prisma.$connect();
+
+await prisma.$queryRaw`PRAGMA journal_mode = WAL;`.catch((e) => {
+    console.error("Failed to set journal mode to WAL:", e);
+});
 
 export default prisma;