diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2638591..357b895 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,12 @@
 
 All notable changes to this project will be documented in this file.
 
+## [2.5.1] - 2026-10-24
+
+### Fixed
+- Open credential and usage databases with node:sqlite’s supported `readOnly` option; the lowercase spelling was ignored.
+- Add a real SQLite regression proving writes and missing-database creation are rejected.
+
 ## [2.5.0] - 2026-10-24
 
 ### Fixed
diff --git a/package.json b/package.json
index eb61cc1..04a49ee 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "opencode-studio-server",
-  "version": "2.5.0",
+  "version": "2.5.1",
   "private": false,
   "scripts": {
     "start": "concurrently \"npm run server\" \"npm run client\"",
diff --git a/server/index.js b/server/index.js
index 60505a2..c38b9ec 100644
--- a/server/index.js
+++ b/server/index.js
@@ -10,6 +10,7 @@ try { ({ DatabaseSync } = require('node:sqlite')); } catch {}
 const { spawn, exec, execSync } = require('child_process');
 const yaml = require('js-yaml');
 const configProviders = require('./lib/config-providers');
+const { openReadOnlyDatabase } = require('./lib/read-only-database');
 const { readCliConfig, writeCliConfig } = require('./lib/cli-config');
 const { readNativeCredentialMetadata } = require('./lib/native-credentials');
 const { pluginName, isNativeAgent, hasNativeMcp, readConfigMaps, agentView, mergeNativeAgentUpdate } = require('./lib/opencode-compat');
@@ -5052,7 +5053,7 @@ function tryReadUsageFromSqlite(opts) {
     const { dbPath, projectIdFilter, min, max, granularity } = opts;
     let db;
     try {
-        db = new DatabaseSync(dbPath, { readonly: true });
+        db = openReadOnlyDatabase(DatabaseSync, dbPath);
 
         const tables = new Set(db.prepare("SELECT name FROM sqlite_master WHERE type = 'table'").all().map(row => row.name));
         const native = tables.has('session_message') && tables.has('session_v2');
diff --git a/server/lib/native-credentials.js b/server/lib/native-credentials.js
index 8ffd53a..76c3fa3 100644
--- a/server/lib/native-credentials.js
+++ b/server/lib/native-credentials.js
@@ -1,5 +1,6 @@
 const fs = require('node:fs');
 const path = require('node:path');
+const { openReadOnlyDatabase } = require('./read-only-database');
 
 // Metadata only. Never select credential.value or rewrite OpenCode's database.
 function readNativeCredentialMetadata(dataDirectories, DatabaseSync) {
@@ -9,7 +10,7 @@ function readNativeCredentialMetadata(dataDirectories, DatabaseSync) {
         if (!fs.existsSync(file)) continue;
         let db;
         try {
-            db = new DatabaseSync(file, { readonly: true });
+            db = openReadOnlyDatabase(DatabaseSync, file);
             if (!db.prepare("SELECT 1 FROM sqlite_master WHERE type='table' AND name='credential'").get()) continue;
             const credentials = db.prepare('SELECT id, integration_id, label, active FROM credential ORDER BY label, id').all()
                 .map(row => ({ id: row.id, integrationID: row.integration_id, label: row.label, active: !!row.active }));
diff --git a/server/lib/read-only-database.js b/server/lib/read-only-database.js
new file mode 100644
index 0000000..7cd67a4
--- /dev/null
+++ b/server/lib/read-only-database.js
@@ -0,0 +1,6 @@
+// node:sqlite uses camel-case readOnly. An unknown `readonly` option is ignored.
+function openReadOnlyDatabase(DatabaseSync, file) {
+    if (!DatabaseSync) throw new Error('SQLite requires a compatible Node runtime');
+    return new DatabaseSync(file, { readOnly: true });
+}
+module.exports = { openReadOnlyDatabase };
diff --git a/server/lib/read-only-database.test.js b/server/lib/read-only-database.test.js
new file mode 100644
index 0000000..fc89724
--- /dev/null
+++ b/server/lib/read-only-database.test.js
@@ -0,0 +1,28 @@
+const { test } = require('node:test');
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const os = require('node:os');
+const path = require('node:path');
+const { DatabaseSync } = require('node:sqlite');
+const { openReadOnlyDatabase } = require('./read-only-database');
+
+test('read-only database rejects writes and cannot create a missing database', () => {
+    const directory = fs.mkdtempSync(path.join(os.tmpdir(), 'studio-readonly-db-'));
+    const file = path.join(directory, 'fixture.db');
+    let reader;
+    try {
+        const setup = new DatabaseSync(file);
+        setup.exec('CREATE TABLE fixture(value TEXT); INSERT INTO fixture VALUES (\'keep\')');
+        setup.close();
+        reader = openReadOnlyDatabase(DatabaseSync, file);
+        assert.equal(reader.prepare('SELECT value FROM fixture').get().value, 'keep');
+        assert.throws(() => reader.exec("INSERT INTO fixture VALUES ('must fail')"), /readonly|read-only/i);
+        assert.equal(reader.prepare('SELECT count(*) AS count FROM fixture').get().count, 1);
+        const missing = path.join(directory, 'missing.db');
+        assert.throws(() => openReadOnlyDatabase(DatabaseSync, missing));
+        assert.equal(fs.existsSync(missing), false);
+    } finally {
+        if (reader) reader.close();
+        fs.rmSync(directory, { recursive: true, force: true });
+    }
+});
diff --git a/server/package-lock.json b/server/package-lock.json
index ada7968..a1202bb 100644
--- a/server/package-lock.json
+++ b/server/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "opencode-studio-server",
-  "version": "2.5.0",
+  "version": "2.5.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "opencode-studio-server",
-      "version": "2.5.0",
+      "version": "2.5.1",
       "hasInstallScript": true,
       "license": "MIT",
       "dependencies": {
diff --git a/server/package.json b/server/package.json
index 95e4f70..d1bf3ef 100644
--- a/server/package.json
+++ b/server/package.json
@@ -1,6 +1,6 @@
 {
   "name": "opencode-studio-server",
-  "version": "2.5.0",
+  "version": "2.5.1",
   "description": "Backend server for OpenCode Studio - manages opencode configurations",
   "main": "index.js",
   "bin": {