SyncEngine primary key migration tool (#226)

* Automatic tool for migrating primary keys.

* more todos

* move stuff to library

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* more tests

* handle non-int primary key

* more tests

* wip

* index/trigger test

* tests

* wip

* md5 hash the id and table name for backfilling ids.

* handle row ids

* clean up

* wip

* foreign key checks and docs.

* fix merge conflict

* tests

* fixes

* merge fix

* docs

* wip

* Fix comment formatting in migratePrimaryKeys function

---------

Co-authored-by: Brandon Williams <[email protected]>

Author: stephencelis

Package.resolved

@@ -35,7 +35,7 @@ library, [subscribe today](https://www.pointfree.co/pricing).
 ## Overview
 
 SQLiteData is a [fast](#performance), lightweight replacement for SwiftData, including CloudKit
-synchronization (and even CloudKit sharing), built on top of the popular [GRDB] library. 
+synchronization (and even CloudKit sharing), built on top of the popular [GRDB] library.
 To populate data from the database you can use `@Table` and `@FetchAll`, which are
 similar to SwiftData's `@Model` and `@Query`:
 

README.md

@@ -1,26 +1,28 @@
-import Dependencies
-import Foundation
+#if canImport(CloudKit)
+  import Dependencies
+  import Foundation
 
-package struct CurrentTimeGenerator: DependencyKey, Sendable {
-  private var generate: @Sendable () -> Int64
-  package var now: Int64 {
-    get { self.generate() }
-    set { self.generate = { newValue } }
+  package struct CurrentTimeGenerator: DependencyKey, Sendable {
+    private var generate: @Sendable () -> Int64
+    package var now: Int64 {
+      get { self.generate() }
+      set { self.generate = { newValue } }
+    }
+    package func callAsFunction() -> Int64 {
+      self.generate()
+    }
+    package static var liveValue: CurrentTimeGenerator {
+      Self { Int64(clock_gettime_nsec_np(CLOCK_REALTIME)) }
+    }
+    package static var testValue: CurrentTimeGenerator {
+      Self { Int64(clock_gettime_nsec_np(CLOCK_REALTIME)) }
+    }
   }
-  package func callAsFunction() -> Int64 {
-    self.generate()
-  }
-  package static var liveValue: CurrentTimeGenerator {
-    Self { Int64(clock_gettime_nsec_np(CLOCK_REALTIME)) }
-  }
-  package static var testValue: CurrentTimeGenerator {
-    Self { Int64(clock_gettime_nsec_np(CLOCK_REALTIME)) }
-  }
-}
 
-extension DependencyValues {
-  package var currentTime: CurrentTimeGenerator {
-    get { self[CurrentTimeGenerator.self] }
-    set { self[CurrentTimeGenerator.self] = newValue }
+  extension DependencyValues {
+    package var currentTime: CurrentTimeGenerator {
+      get { self[CurrentTimeGenerator.self] }
+      set { self[CurrentTimeGenerator.self] = newValue }
+    }
   }
-}
+#endif

Sources/SQLiteData/CloudKit/Internal/DatetimeGenerator.swift

@@ -1,4 +1,4 @@
-#if canImport(UIKit)
+#if canImport(CloudKit) && canImport(UIKit)
   import UIKit
 
   private enum DefaultNotificationCenterKey: DependencyKey {

Sources/SQLiteData/CloudKit/Internal/DefaultNotificationCenter.swift

@@ -1,20 +1,22 @@
-import Foundation
+#if canImport(CloudKit)
+  import Foundation
 
-final class IsolatedWeakVar<T: AnyObject>: @unchecked Sendable {
-  let lock = NSLock()
-  weak var _value: T?
+  final class IsolatedWeakVar<T: AnyObject>: @unchecked Sendable {
+    let lock = NSLock()
+    weak var _value: T?
 
-  init() {}
+    init() {}
 
-  var value: T? {
-    lock.lock()
-    defer { lock.unlock() }
-    return _value
+    var value: T? {
+      lock.lock()
+      defer { lock.unlock() }
+      return _value
+    }
+    func set(_ value: T) {
+      precondition(_value == nil)
+      lock.lock()
+      defer { lock.unlock() }
+      _value = value
+    }
   }
-  func set(_ value: T) {
-    precondition(_value == nil)
-    lock.lock()
-    defer { lock.unlock() }
-    _value = value
-  }
-}
+#endif