diff --git a/packages/core/src/database/database.ts b/packages/core/src/database/database.ts
index 249152333da..1f02ae29dc5 100644
--- a/packages/core/src/database/database.ts
+++ b/packages/core/src/database/database.ts
@@ -5,8 +5,6 @@ import { sqliteLayer, supportsForeignKeyToggle, supportsTuningPragmas } from "#s
 import { Context, Effect, Layer, Schema, Semaphore } from "effect"
 import type { SqlClient } from "effect/unstable/sql"
 import { Global } from "@opencode/util/global"
-import { closeSync, existsSync, openSync } from "node:fs"
-import { chmod } from "node:fs/promises"
 import { isAbsolute, join } from "path"
 import { DatabaseMigration } from "./migration.js"
 import { makeGlobalNode } from "@opencode/util/effect/app-node"
@@ -72,31 +70,13 @@ export function layer(options: Options = { path: ":memory:" }) {
           Layer.provide(sqliteLayer({ filename })),
         )
       const filename = options.path ?? ":memory:"
-      if (filename === ":memory:") return provide(filename)
-      const file = isAbsolute(filename) ? filename : join((yield* Global.Service).data, filename)
-      yield* Effect.promise(() => restrictToOwner(file))
-      return provide(file)
+      if (filename === ":memory:" || isAbsolute(filename)) return provide(filename)
+      const global = yield* Global.Service
+      return provide(join(global.data, filename))
     }),
   )
 }
 
-// SQLite creates new sidecars with the database's mode, but does not tighten existing sidecars.
-// Windows relies on the user profile directory's inherited ACLs instead of POSIX modes.
-async function restrictToOwner(filename: string) {
-  if (process.platform === "win32") return
-  // Opening and closing an existing database can release another connection's POSIX locks.
-  // Create missing files synchronously so another fiber cannot open one before it is restricted.
-  if (!existsSync(filename)) closeSync(openSync(filename, "a", 0o600))
-  await chmod(filename, 0o600)
-  await Promise.all(
-    [`${filename}-wal`, `${filename}-shm`].map((file) =>
-      chmod(file, 0o600).catch((error: NodeJS.ErrnoException) => {
-        if (error.code !== "ENOENT") throw error
-      }),
-    ),
-  )
-}
-
 // The database service over an injected SqlClient, for runtimes that receive
 // database storage instead of opening a filesystem path. Any client provided
 // here still goes through the pragma guards and migrations; Global is required
diff --git a/packages/core/test/database.test.ts b/packages/core/test/database.test.ts
deleted file mode 100644
index 7a8df62493f..00000000000
--- a/packages/core/test/database.test.ts
+++ /dev/null
@@ -1,39 +0,0 @@
-import { describe, expect, test } from "bun:test"
-import { chmod, stat, writeFile } from "node:fs/promises"
-import path from "path"
-import { Effect, Layer } from "effect"
-import { Database } from "@opencode/core/database/database"
-import { Global } from "@opencode/util/global"
-import { tmpdir } from "./fixture/tmpdir"
-
-// Read while the connection is open: SQLite may remove the sidecars on close.
-const openModes = (filename: string) =>
-  Effect.runPromise(
-    Effect.gen(function* () {
-      yield* Layer.build(Database.layer({ path: filename }))
-      return yield* Effect.promise(() =>
-        Promise.all(["", "-wal", "-shm"].map(async (suffix) => (await stat(filename + suffix)).mode & 0o777)),
-      )
-    }).pipe(Effect.scoped, Effect.provideService(Global.Service, Global.make({ data: path.dirname(filename) }))),
-  )
-
-describe.skipIf(process.platform === "win32")("Database file permissions", () => {
-  test("creates the database and sidecars readable only by the owner", async () => {
-    await using tmp = await tmpdir()
-
-    expect(await openModes(path.join(tmp.path, "opencode.db"))).toEqual([0o600, 0o600, 0o600])
-  })
-
-  test("tightens an existing database and sidecars", async () => {
-    await using tmp = await tmpdir()
-    const filename = path.join(tmp.path, "opencode.db")
-    await Promise.all(
-      ["", "-wal", "-shm"].map(async (suffix) => {
-        await writeFile(filename + suffix, "")
-        await chmod(filename + suffix, 0o644)
-      }),
-    )
-
-    expect(await openModes(filename)).toEqual([0o600, 0o600, 0o600])
-  })
-})