From e55807cea722be44a4d8d1a4a589dc35ea5fcfda Mon Sep 17 00:00:00 2001
From: Stephen Celis <stephen@stephencelis.com>
Date: Wed, 26 Aug 2026 11:50:38 -0700
Subject: [PATCH 1/2] Clean up test databases at exit

While test databases are provisioned in the temporary directory, the OS
doesn't necessarily actively clean them up till restart. So we've heard
a report of a user with a long uptime accumulating many, many gigabytes
over many hundreds of test runs.

This adds a small `atexit` hook to prune temporary databases. It won't
run if tests are cancelled or crashed, but those cases seem rare enough
that we can let the OS do that cleanup eventually.
---
 .../CloudKit/DefaultSyncEngine.swift          |  6 +----
 .../Internal/TemporaryDatabase.swift          | 24 +++++++++++++++++++
 .../DefaultDatabase.swift                     |  5 +---
 3 files changed, 26 insertions(+), 9 deletions(-)
 create mode 100644 Sources/SQLiteData/Internal/TemporaryDatabase.swift

diff --git a/Sources/SQLiteData/CloudKit/DefaultSyncEngine.swift b/Sources/SQLiteData/CloudKit/DefaultSyncEngine.swift
index a8edd53c..af7264f8 100644
--- a/Sources/SQLiteData/CloudKit/DefaultSyncEngine.swift
+++ b/Sources/SQLiteData/CloudKit/DefaultSyncEngine.swift
@@ -55,11 +55,7 @@
     }
 
     public static var testValue: SyncEngine {
-      try! SyncEngine(
-        for: DatabasePool(
-          path: URL.temporaryDirectory.appending(path: "\(UUID().uuidString).sqlite").path()
-        )
-      )
+      try! SyncEngine(for: temporaryDatabasePool())
     }
   }
 #endif
diff --git a/Sources/SQLiteData/Internal/TemporaryDatabase.swift b/Sources/SQLiteData/Internal/TemporaryDatabase.swift
new file mode 100644
index 00000000..d343b5ce
--- /dev/null
+++ b/Sources/SQLiteData/Internal/TemporaryDatabase.swift
@@ -0,0 +1,24 @@
+import Foundation
+import GRDB
+
+func temporaryDatabasePool(configuration: Configuration = Configuration()) throws -> DatabasePool {
+  try FileManager.default.createDirectory(
+    at: temporaryDatabaseDirectory, withIntermediateDirectories: true
+  )
+  return try DatabasePool(
+    path: temporaryDatabaseDirectory
+      .appending(path: "\(UUID().uuidString).db")
+      .path(percentEncoded: false),
+    configuration: configuration
+  )
+}
+
+private let temporaryDatabaseDirectory: URL = {
+  atexit {
+    try? FileManager.default.removeItem(at: temporaryDatabaseDirectory)
+  }
+  return URL.temporaryDirectory.appending(
+    path: "co.pointfree.SQLiteData/\(ProcessInfo.processInfo.processIdentifier)",
+    directoryHint: .isDirectory
+  )
+}()
diff --git a/Sources/SQLiteData/StructuredQueries+GRDB/DefaultDatabase.swift b/Sources/SQLiteData/StructuredQueries+GRDB/DefaultDatabase.swift
index 2f70021d..1a6ee3ca 100644
--- a/Sources/SQLiteData/StructuredQueries+GRDB/DefaultDatabase.swift
+++ b/Sources/SQLiteData/StructuredQueries+GRDB/DefaultDatabase.swift
@@ -36,10 +36,7 @@ public func defaultDatabase(
     }
     database = try DatabasePool(path: path ?? defaultPath, configuration: configuration)
   case .preview, .test:
-    database = try DatabasePool(
-      path: "\(NSTemporaryDirectory())\(UUID().uuidString).db",
-      configuration: configuration
-    )
+    database = try temporaryDatabasePool(configuration: configuration)
   }
   return database
 }

From f47c20b5387aba90b39a33bab06a8983beac58a4 Mon Sep 17 00:00:00 2001
From: Stephen Celis <stephen@stephencelis.com>
Date: Wed, 26 Aug 2026 12:12:41 -0700
Subject: [PATCH 2/2] Fix

---
 .../Internal/TemporaryDatabase.swift          | 20 +++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/Sources/SQLiteData/Internal/TemporaryDatabase.swift b/Sources/SQLiteData/Internal/TemporaryDatabase.swift
index d343b5ce..1da57181 100644
--- a/Sources/SQLiteData/Internal/TemporaryDatabase.swift
+++ b/Sources/SQLiteData/Internal/TemporaryDatabase.swift
@@ -14,11 +14,23 @@ func temporaryDatabasePool(configuration: Configuration = Configuration()) throw
 }
 
 private let temporaryDatabaseDirectory: URL = {
-  atexit {
-    try? FileManager.default.removeItem(at: temporaryDatabaseDirectory)
+  let directory = URL.temporaryDirectory.appending(
+    path: "co.pointfree.SQLiteData",
+    directoryHint: .isDirectory
+  )
+  let processDirectories =
+    (try? FileManager.default.contentsOfDirectory(at: directory, includingPropertiesForKeys: nil))
+    ?? []
+  for processDirectory in processDirectories {
+    guard
+      let processIdentifier = pid_t(processDirectory.lastPathComponent),
+      kill(processIdentifier, 0) != 0,
+      errno == ESRCH
+    else { continue }
+    try? FileManager.default.removeItem(at: processDirectory)
   }
-  return URL.temporaryDirectory.appending(
-    path: "co.pointfree.SQLiteData/\(ProcessInfo.processInfo.processIdentifier)",
+  return directory.appending(
+    path: "\(ProcessInfo.processInfo.processIdentifier)",
     directoryHint: .isDirectory
   )
 }()