Refactoring II.

- Filter by date range
- SyncUpdate tasks run fully asynchronous in background
- Move tableView manipulations into FilterPipelineDelegate
- Move SyncUpdate notification into SyncUpdateDelegate
- Fix: sync cache before persisting a recording
- Restructuring GroupedDomainDataSource
- Performance: db logs queries use rowids instead of timestamps
- Add 'now' button to DatePickerAlert

AppCheck.xcodeproj/project.pbxproj

@@ -16,6 +16,7 @@
 		541AC5DD2399498A00A769D7 /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 541AC5DB2399498A00A769D7 /* Main.storyboard */; };
 		541AC5DF2399498B00A769D7 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 541AC5DE2399498B00A769D7 /* Assets.xcassets */; };
 		541AC5E22399498B00A769D7 /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 541AC5E02399498B00A769D7 /* LaunchScreen.storyboard */; };
+		541FC9872497D81C00962623 /* TheGreatDestroyer.swift in Sources */ = {isa = PBXBuildFile; fileRef = 541FC9862497D81C00962623 /* TheGreatDestroyer.swift */; };
 		542E2A982404973F001462DC /* TBCMain.swift in Sources */ = {isa = PBXBuildFile; fileRef = 542E2A972404973F001462DC /* TBCMain.swift */; };
 		542E2A9A24051556001462DC /* TVCSettings.swift in Sources */ = {isa = PBXBuildFile; fileRef = 542E2A9924051556001462DC /* TVCSettings.swift */; };
 		543CDB2023EEE61900B7F323 /* PacketTunnelProvider.swift in Sources */ = {isa = PBXBuildFile; fileRef = 543CDB1F23EEE61900B7F323 /* PacketTunnelProvider.swift */; };
@@ -175,6 +176,7 @@
 		541AC5DE2399498B00A769D7 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
 		541AC5E12399498B00A769D7 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
 		541AC5E32399498B00A769D7 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		541FC9862497D81C00962623 /* TheGreatDestroyer.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TheGreatDestroyer.swift; sourceTree = "<group>"; };
 		542E2A972404973F001462DC /* TBCMain.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TBCMain.swift; sourceTree = "<group>"; };
 		542E2A9924051556001462DC /* TVCSettings.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TVCSettings.swift; sourceTree = "<group>"; };
 		543CDB1D23EEE61900B7F323 /* GlassVPN.appex */ = {isa = PBXFileReference; explicitFileType = "wrapper.app-extension"; includeInIndex = 0; path = GlassVPN.appex; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -434,6 +436,7 @@
 				54D8B97D2471B88900EB2414 /* DBCommon.swift */,
 				54D8B9822471BD8100EB2414 /* DBAppOnly.swift */,
 				54B345AC241BBB00004C53CC /* DBExtensions.swift */,
+				541FC9862497D81C00962623 /* TheGreatDestroyer.swift */,
 			);
 			path = DB;
 			sourceTree = "<group>";
@@ -848,6 +851,7 @@
 				542E2A982404973F001462DC /* TBCMain.swift in Sources */,
 				54448A3224899A4000771C96 /* SearchBarManager.swift in Sources */,
 				5458EBC0243A3F2200CFEB15 /* TVCRecordingDetails.swift in Sources */,
+				541FC9872497D81C00962623 /* TheGreatDestroyer.swift in Sources */,
 				5412F8EE24571B8200A63D7A /* VCDateFilter.swift in Sources */,
 				545DDDD124436983003B6544 /* QuickUI.swift in Sources */,
 				541AC5D82399498A00A769D7 /* AppDelegate.swift in Sources */,

main/Common Classes/DatePickerAlert.swift

@@ -2,6 +2,10 @@ import UIKit
 
 class DatePickerAlert: UIViewController {
 	
+	override var keyCommands: [UIKeyCommand]? {
+		[UIKeyCommand(input: UIKeyCommand.inputEscape, modifierFlags: [], action: #selector(didTapCancel))]
+	}
+	
 	private var callback: (Date) -> Void
 	private let picker: UIDatePicker = {
 		let x = UIDatePicker()
@@ -23,14 +27,17 @@ class DatePickerAlert: UIViewController {
 	}
 	
 	internal override func loadView() {
-		let cancel = QuickUI.button("Cancel", target: self, action: #selector(didTapCancel))
+		let cancel = QuickUI.button("Discard", target: self, action: #selector(didTapCancel))
 		let save = QuickUI.button("Save", target: self, action: #selector(didTapSave))
+		let now = QuickUI.button("Now", target: self, action: #selector(didTapNow))
 		save.titleLabel?.font = save.titleLabel?.font.bold()
+		now.titleLabel?.font = now.titleLabel?.font.bold()
+		now.setTitleColor(.sysFg, for: .normal)
 		//cancel.setTitleColor(.systemRed, for: .normal)
 		
-		let buttons = UIStackView(arrangedSubviews: [cancel, save])
+		let buttons = UIStackView(arrangedSubviews: [cancel, now, save])
 		buttons.axis = .horizontal
-		buttons.distribution = .fillEqually
+		buttons.distribution = .equalSpacing
 		
 		let bg = UIView(frame: picker.frame)
 		bg.frame.size.height += buttons.frame.height + 15
@@ -45,7 +52,7 @@ class DatePickerAlert: UIViewController {
 		
 		picker.anchor([.leading, .trailing, .top], to: bg)
 		picker.bottomAnchor =&= buttons.topAnchor
-		buttons.anchor([.leading, .trailing], to: bg)
+		buttons.anchor([.leading, .trailing], to: bg, margin: 25)
 		buttons.bottomAnchor =&= bg.bottomAnchor - 15
 		bg.anchor([.leading, .trailing, .bottom], to: clearBg)
 		
@@ -53,6 +60,10 @@ class DatePickerAlert: UIViewController {
 		view.isHidden = true // otherwise picker will flash on present
 	}
 	
+	@objc private func didTapNow() {
+		picker.date = Date()
+	}
+	
 	@objc private func didTapSave() {
 		dismiss(animated: true) {
 			self.callback(self.picker.date)

main/Common Classes/FilterPipeline.swift

@@ -1,34 +1,36 @@
 import UIKit
 
-protocol FilterPipelineDelegate: UITableViewController {
-	/// Currently only called when a row is moved and the `tableView` is frontmost.
-	func rowNeedsUpdate(_ row: Int)
+protocol FilterPipelineDelegate: AnyObject {
+	/// Call `reloadData()` on main thread.
+	/// - Warning: This function may be called from a background thread.
+	func filterPipelineDidReset()
+	
+	/// Call `safeDeleteRows()` on main thread.
+	/// - Warning: This function may be called from a background thread.
+	func filterPipeline(delete rows: [Int])
+	
+	/// Call `safeInsertRow()` on main thread.
+	/// - Warning: This function may be called from a background thread.
+	func filterPipeline(insert row: Int)
+	
+	/// Call `safeReloadRow()` on main thread.
+	/// - Warning: This function may be called from a background thread.
+	func filterPipeline(update row: Int)
+	
+	/// Call `safeMoveRow()` on main thread.
+	/// - Warning: This function may be called from a background thread.
+	func filterPipeline(move oldRow: Int, to newRow: Int)
 }
 
-// MARK: FilterPipeline
+// MARK: - FilterPipeline
 
 class FilterPipeline<T> {
-	typealias DataSourceQuery = () -> [T]
-
-	private var sourceQuery: DataSourceQuery!
+	
 	private(set) fileprivate var dataSource: [T] = []
 	
 	private var pipeline: [PipelineFilter<T>] = []
 	private var display: PipelineSorting<T>!
-	private(set) weak var delegate: FilterPipelineDelegate?
-	
-	private var cellAnimations: Bool = true
-	
-	required init(withDelegate: FilterPipelineDelegate) {
-		delegate = withDelegate
-	}
-	
-	/// Set a new `dataSource` query and immediately apply all filters and sorting.
-	/// - Note: You must call `reload(fromSource:whenDone:)` manually!
-	/// - Note: Always use `[unowned self]`
-	func setDataSource(query: @escaping DataSourceQuery) {
-		sourceQuery = query
-	}
+	weak var delegate: FilterPipelineDelegate?
 	
 	/// - Returns: Number of elements in `projection`
 	@inline(__always) func displayObjectCount() -> Int { display.projection.count }
@@ -49,20 +51,12 @@ class FilterPipeline<T> {
 		return (i, dataSource[i])
 	}
 	
-	/// Re-query data source and re-built filter and display sorting order.
-	/// - Note: Will call `reloadData()` before `whenDone` closure is executed. But only if `cellAnimations` are enabled.
-	/// - Parameter fromSource: If `false` only re-built filter and sort order
-	func reload(fromSource: Bool, whenDone: @escaping () -> Void) {
-		DispatchQueue.global().async {
-			if fromSource {
-				self.dataSource = self.sourceQuery()
-			}
-			self.resetFilters()
-			DispatchQueue.main.sync {
-				self.reloadTableCells()
-				whenDone()
-			}
-		}
+	/// Set new data source and re-built filter and display sorting order.
+	/// - Note: Will call `filterPipelineDidReset()`
+	func reset(dataSource: [T]) {
+		self.dataSource = dataSource
+		self.resetFilters()
+		delegate?.filterPipelineDidReset()
 	}
 	
 	/// Returns the index set of either the last filter layer, or `dataSource` if no filter is set.
@@ -80,12 +74,14 @@ class FilterPipeline<T> {
 	
 	/// Add new filter layer. Each layer is applied upon the previous layer. Therefore, each filter
 	/// can only restrict the display further. A filter cannot introduce previously removed elements.
-	/// - Note: Will call `reloadData()` if `cellAnimations` are enabled.
+	/// - Warning: Use `[unowned self]` to prevent retain cycles!
+	/// - Note: Will call `filterPipelineDidReset()`
 	/// - Parameters:
 	///   - identifier: Use this id to find the filter again. For reload and remove operations.
 	///   - otherId: If `nil` or non-existent the new filter will be appended at the end.
 	///   - predicate: Return `true` if you want to keep the element.
 	func addFilter(_ identifier: String, before otherId: String? = nil, _ predicate: @escaping PipelineFilter<T>.Predicate) {
+		guard indexOfFilter(identifier) == nil else { return }
 		let newFilter = PipelineFilter(identifier, predicate)
 		if let other = otherId, let i = indexOfFilter(other) {
 			pipeline.insert(newFilter, at: i)
@@ -95,11 +91,11 @@ class FilterPipeline<T> {
 			pipeline.append(newFilter)
 			display?.apply(moreRestrictive: newFilter.selection)
 		}
-		reloadTableCells()
+		delegate?.filterPipelineDidReset()
 	}
 	
 	/// Find and remove filter with given identifier. Will automatically update remaining filters and display sorting.
-	/// - Note: Will call `reloadData()` if `cellAnimations` are enabled.
+	/// - Note: Will call `filterPipelineDidReset()`
 	func removeFilter(withId ident: String) {
 		guard let i = indexOfFilter(ident) else { return }
 		pipeline.remove(at: i)
@@ -109,32 +105,34 @@ class FilterPipeline<T> {
 		} else {
 			resetFilters(startingAt: i)
 		}
-		reloadTableCells()
+		delegate?.filterPipelineDidReset()
 	}
 	
 	/// Start filter evaluation on all entries from previous filter.
-	/// - Note: Will call `reloadData()` if `cellAnimations` are enabled.
+	/// - Note: Will call `filterPipelineDidReset()`
 	func reloadFilter(withId ident: String) {
 		guard let i = indexOfFilter(ident) else { return }
 		resetFilters(startingAt: i)
-		reloadTableCells()
+		delegate?.filterPipelineDidReset()
 	}
 	
 	/// Sets the sort and display order. You should set the `delegate` to automatically update your `tableView`.
-	/// - Note: Will call `reloadData()` if `cellAnimations` are enabled.
+	/// - Warning: Use `[unowned self]` to prevent retain cycles!
+	/// - Note: Will call `filterPipelineDidReset()`
 	/// - Parameter predicate: Return `true` if first element should be sorted before second element.
 	func setSorting(_ predicate: @escaping PipelineSorting<T>.Predicate) {
 		display = .init(predicate, pipe: self)
-		reloadTableCells()
+		delegate?.filterPipelineDidReset()
 	}
 	
 	/// Will reverse the current display order without resorting. This is faster than setting a new sorting `predicate`.
 	/// However, the `predicate` must be dynamic and support a sort order flag.
+	/// - Note: Will call `filterPipelineDidReset()`
 	/// - Warning: Make sure `predicate` does reflect the change or it will lead to data inconsistency!
 	func reverseSorting() {
 		// TODO: use semaphore to prevent concurrent edits
 		display?.reverseOrder()
-		reloadTableCells()
+		delegate?.filterPipelineDidReset()
 	}
 	
 	/// Re-built filter and display sorting order.
@@ -173,26 +171,8 @@ class FilterPipeline<T> {
 	
 	// MARK: data updates
 	
-	/// Disable individual cell updates (update, move, insert & remove actions)
-	func pauseCellAnimations(if condition: Bool = true) {
-		cellAnimations = !condition && delegate?.tableView.isFrontmost ?? false
-	}
-	
-	/// Allow individual cell updates (update, move, insert & remove actions) if tableView `isFrontmost`
-	/// - Parameter reloadTable: If `true` and cell animations are disabled, perform `tableView.reloadData()`
-	func continueCellAnimations(reloadTable: Bool = true) {
-		if !cellAnimations {
-			cellAnimations = true
-			if reloadTable { delegate?.tableView.reloadData() }
-		}
-	}
-	
-	/// Reload table but only if `cellAnimations` is enabled.
-	func reloadTableCells() {
-		if cellAnimations { delegate?.tableView.reloadData() }
-	}
-	
 	/// Add new element to the original `dataSource` and immediately apply filter and sorting.
+	/// - Note: Will call `filterPipeline(insert:)` if not filtered.
 	/// - Complexity: O((*m*+1) log *n*), where *m* is the number of filters and *n* the number of elements in each filter.
 	func addNew(_ obj: T) {
 		let index = dataSource.count
@@ -202,10 +182,11 @@ class FilterPipeline<T> {
 		}
 		// survived all filters
 		let displayIndex = display.insertNew(index)
-		if cellAnimations { delegate?.tableView.safeInsertRow(displayIndex, with: .left) }
+		delegate?.filterPipeline(insert: displayIndex)
 	}
 	
 	/// Update element at `index` in the original `dataSource` and immediately re-apply filter and sorting.
+	/// - Note: Will call `filterPipeline(delete:)`, `(insert:)`, `(update:)`, or `(move:)`
 	/// - Parameters:
 	///   - obj: Element to be added. Will overwrite previous `dataSource` object.
 	///   - index: Index in the original `dataSource`
@@ -219,27 +200,23 @@ class FilterPipeline<T> {
 		let oldPos = display.deleteOld(index)
 		dataSource[index] = obj
 		guard status.display else {
-			if cellAnimations, oldPos != -1 { delegate?.tableView.safeDeleteRows([oldPos]) }
+			if oldPos != -1 { delegate?.filterPipeline(delete: [oldPos]) }
 			return
 		}
 		let newPos = display.insertNew(index, previousIndex: oldPos)
-		if cellAnimations {
-			if oldPos == -1 {
-				delegate?.tableView.safeInsertRow(newPos, with: .left)
+		if oldPos == -1 {
+			delegate?.filterPipeline(insert: newPos)
+		} else {
+			if oldPos == newPos {
+				delegate?.filterPipeline(update: oldPos)
 			} else {
-				if oldPos == newPos {
-					delegate?.tableView.safeReloadRow(oldPos)
-				} else {
-					delegate?.tableView.safeMoveRow(oldPos, to: newPos)
-					if delegate?.tableView.isFrontmost ?? false {
-						delegate?.rowNeedsUpdate(newPos)
-					}
-				}
+				delegate?.filterPipeline(move: oldPos, to: newPos)
 			}
 		}
 	}
 	
 	/// Remove elements from the original `dataSource`, from all filters, and from display sorting.
+	/// - Note: Will call `filterPipeline(delete:)` if `sorted` array is not empty.
 	/// - Parameter sorted: Indices in the original `dataSource`
 	/// - Complexity: O(*t*(*m*+*n*) + *m* log *n*), where *t* is the number of filters,
 	///               *m* the number of elements in each filter / projection, and *n* the length of `sorted` indices.
@@ -252,14 +229,16 @@ class FilterPipeline<T> {
 			filter.shiftRemove(indices: sorted)
 		}
 		let indices = display.shiftRemove(indices: sorted)
-		if cellAnimations { delegate?.tableView.safeDeleteRows(indices) }
+		delegate?.filterPipeline(delete: indices)
 	}
 }
 
 
 // MARK: - Filter
 
-class PipelineFilter<T> {
+class PipelineFilter<T>: CustomStringConvertible {
+	var description: String { "\(Self.self)(id: \(id))" }
+	
 	typealias Predicate = (T) -> Bool
 	
 	let id: String

main/DB/DBAppOnly.swift

@@ -56,14 +56,31 @@ extension SQLiteDatabase {
 	}
 }
 
-struct WhereClauseBuilder: CustomStringConvertible {
+class WhereClauseBuilder: CustomStringConvertible {
 	var description: String = ""
 	private let prefix: String
 	private(set) var bindings: [DBBinding] = []
+	
 	init(prefix p: String = "WHERE") { prefix = "\(p) " }
-	mutating func and(_ clause: String, _ bind: DBBinding ...) {
+	
+	/// Append new clause by either prepending `WHERE` prefix or placing `AND` between clauses.
+	@discardableResult func and(_ clause: String, _ bind: DBBinding ...) -> Self {
 		description.append((description=="" ? prefix : " AND ") + clause)
 		bindings.append(contentsOf: bind)
+		return self
+	}
+	/// Restrict to `rowid >= {range}.start AND rowid <= {range}.end`.
+	/// Omitted if range is `nil` or individually if a value is `0`.
+	@discardableResult func and(in range: SQLiteRowRange) -> Self {
+		if range.start != 0 { and("rowid >= ?", BindInt64(range.start)) }
+		if range.end != 0 { and("rowid <= ?", BindInt64(range.end)) }
+		return self
+	}
+	/// Restrict to `ts >= {min} AND ts < {max}`. Omit one or the other if value is `0`.
+	@discardableResult func and(min: Timestamp = 0, max: Timestamp = 0) -> Self {
+		if min != 0 { and("ts >= ?", BindInt64(min)) }
+		if max != 0 { and("ts < ?", BindInt64(max)) }
+		return self
 	}
 }
 
@@ -119,8 +136,7 @@ extension SQLiteDatabase {
 	/// - Parameter strict: If `true`, use `fqdn` instead of `domain` column
 	/// - Returns: Number of changes aka. Number of rows deleted
 	@discardableResult func dnsLogsDelete(_ domain: String, strict: Bool, since ts: Timestamp = 0) -> Int32 {
-		var Where = WhereClauseBuilder()
-		if ts != 0 { Where.and("ts >= ?", BindInt64(ts)) }
+		let Where = WhereClauseBuilder().and(min: ts)
 		Where.and("\(strict ? "fqdn" : "domain") = ?", BindText(domain)) // (fqdn = ? OR fqdn LIKE '%.' || ?)
 		return (try? run(sql: "DELETE FROM heap \(Where);", bind: Where.bindings) { stmt -> Int32 in
 			try ifStep(stmt, SQLITE_DONE)
@@ -130,6 +146,7 @@ extension SQLiteDatabase {
 	
 	// MARK: read
 	
+	/// `SELECT min(ts) FROM heap`
 	func dnsLogsMinDate() -> Timestamp? {
 		try? run(sql:"SELECT min(ts) FROM heap") {
 			try ifStep($0, SQLITE_ROW)
@@ -138,10 +155,14 @@ extension SQLiteDatabase {
 	}
 	
 	/// Select min and max row id with given condition `ts >= ? AND ts < ?`
+	/// - Parameters:
+	///   - ts1: Restrict min `rowid` to `ts >= ?`. Pass `0` to omit restriction.
+	///   - ts2: Restrict max `rowid` to `ts < ?`. Pass `0` to omit restriction.
+	///   - range: If set, only look at the specified range. Default: `(0,0)`
 	/// - Returns: `nil` in case no rows are matching the condition
-	func dnsLogsRowRange(between ts: Timestamp, and ts2: Timestamp) -> SQLiteRowRange? {
-		try? run(sql:"SELECT min(rowid), max(rowid) FROM heap WHERE ts >= ? AND ts < ?",
-				 bind: [BindInt64(ts), BindInt64(ts2)]) {
+	func dnsLogsRowRange(between ts1: Timestamp, and ts2: Timestamp, within range: SQLiteRowRange = (0,0)) -> SQLiteRowRange? {
+		let Where = WhereClauseBuilder().and(in: range).and(min: ts1, max: ts2)
+		return try? run(sql:"SELECT min(rowid), max(rowid) FROM heap \(Where);", bind: Where.bindings) {
 			try ifStep($0, SQLITE_ROW)
 			let max = sqlite3_column_int64($0, 1)
 			return (max == 0) ? nil : (sqlite3_column_int64($0, 0), max)
@@ -151,19 +172,15 @@ extension SQLiteDatabase {
 	/// Group DNS logs by domain, count occurences and number of blocked requests.
 	/// - Parameters:
 	///   - range: Whenever possible set range to improve SQL lookup times. `start <= rowid <= end `
-	///   - ts: Restrict result set `ts >= ?`
+	///   - ts1: Restrict result set `ts >= ?`
 	///   - ts2: Restrict result set `ts < ?`
 	///   - matchingDomain: Restrict `(fqdn|domain) = ?`. Which column is used is determined by `parentDomain`.
 	///   - parentDomain: If `nil` returns `domain` column. Else returns `fqdn` column with restriction on `domain == parentDomain`.
 	/// - Returns: List of grouped domains with no particular sorting order.
-	func dnsLogsGrouped(range: SQLiteRowRange? = nil, since ts: Timestamp = 0, upto ts2: Timestamp = 0,
+	func dnsLogsGrouped(range: SQLiteRowRange = (0,0), since ts1: Timestamp = 0, upto ts2: Timestamp = 0,
 						matchingDomain: String? = nil, parentDomain: String? = nil) -> [GroupedDomain]?
 	{
-		var Where = WhereClauseBuilder()
-		if let from = range?.start { Where.and("rowid >= ?", BindInt64(from)) }
-		if let to = range?.end { Where.and("rowid <= ?", BindInt64(to)) }
-		if ts != 0 { Where.and("ts >= ?", BindInt64(ts)) }
-		if ts2 != 0 { Where.and("ts < ?", BindInt64(ts2)) }
+		let Where = WhereClauseBuilder().and(in: range).and(min: ts1, max: ts2)
 		let col: String // fqdn or domain
 		if let parent = parentDomain { // is subdomain
 			col = "fqdn"
@@ -188,16 +205,9 @@ extension SQLiteDatabase {
 	/// - Parameters:
 	///   - fqdn: Exact match for domain name `fqdn = ?`
 	///   - range: Whenever possible set range to improve SQL lookup times. `start <= rowid <= end `
-	///   - ts: Restrict result set `ts >= ?`
-	///   - ts2: Restrict result set `ts < ?`
 	/// - Returns: List sorted by reverse timestamp order (newest first)
-	func timesForDomain(_ fqdn: String, range: SQLiteRowRange? = nil, since ts: Timestamp = 0, upto ts2: Timestamp = 0) -> [GroupedTsOccurrence]? {
-		var Where = WhereClauseBuilder()
-		if let from = range?.start { Where.and("rowid >= ?", BindInt64(from)) }
-		if let to = range?.end { Where.and("rowid <= ?", BindInt64(to)) }
-		if ts != 0 { Where.and("ts >= ?", BindInt64(ts)) }
-		if ts2 != 0 { Where.and("ts < ?", BindInt64(ts2)) }
-		Where.and("fqdn = ?", BindText(fqdn))
+	func timesForDomain(_ fqdn: String, range: SQLiteRowRange = (0,0)) -> [GroupedTsOccurrence]? {
+		let Where = WhereClauseBuilder().and(in: range).and("fqdn = ?", BindText(fqdn))
 		return try? run(sql: "SELECT ts, COUNT(ts), COUNT(opt) FROM heap \(Where) GROUP BY ts ORDER BY ts DESC;", bind: Where.bindings) {
 			allRows($0) {
 				(sqlite3_column_int64($0, 0), sqlite3_column_int($0, 1), sqlite3_column_int($0, 2))

main/DB/DBCore.swift

@@ -13,6 +13,7 @@ enum SQLiteError: Error {
 /// `try? SQLiteDatabase.open()`
 var AppDB: SQLiteDatabase? { get { try? SQLiteDatabase.open() } }
 typealias SQLiteRowID = sqlite3_int64
+/// `0` indicates an unbound edge.
 typealias SQLiteRowRange = (start: SQLiteRowID, end: SQLiteRowID)
 
 // MARK: - SQLiteDatabase

main/DB/TheGreatDestroyer.swift

@@ -0,0 +1,29 @@
+import Foundation
+
+struct TheGreatDestroyer {
+	
+	/// Callback fired when user performs row edit -> delete action
+	static func deleteLogs(domain: String, since ts: Timestamp, strict flag: Bool) {
+		sync.pause()
+		DispatchQueue.global().async {
+			defer { sync.continue() }
+			guard let db = AppDB, db.dnsLogsDelete(domain, strict: flag, since: ts) > 0 else {
+				return // nothing has changed
+			}
+			db.vacuum()
+			sync.needsReloadDB(domain: domain)
+		}
+	}
+	
+	/// Fired when user taps on Settings -> Delete All Logs
+	static func deleteAllLogs() {
+		sync.pause()
+		DispatchQueue.global().async {
+			defer { sync.continue() }
+			do {
+				try AppDB?.dnsLogsDeleteAll()
+				sync.needsReloadDB()
+			} catch {}
+		}
+	}
+}

main/Data Source/DomainFilter.swift

@@ -1,9 +1,7 @@
 import Foundation
 
 enum DomainFilter {
-	static private var data: [String: FilterOptions] = {
-		AppDB?.loadFilters() ?? [:]
-	}()
+	static private var data = AppDB?.loadFilters() ?? [:]
 	
 	/// Get filter with given `domain` name
 	@inline(__always) static subscript(_ domain: String) -> FilterOptions? {
@@ -12,10 +10,10 @@ enum DomainFilter {
 	
 	/// Update local memory object by loading values from persistent db.
 	/// - Note: Will trigger `NotifyDNSFilterChanged` notification.
-	static func reload() {
-		data = AppDB?.loadFilters() ?? [:]
-		NotifyDNSFilterChanged.post()
-	}
+//	static func reload() {
+//		data = AppDB?.loadFilters() ?? [:]
+//		NotifyDNSFilterChanged.post()
+//	}
 	
 	/// Get list of domains (sorted by name) which do contain the given filter
 	static func list(where matching: FilterOptions) -> [String] {

main/Data Source/GroupedDomainDataSource.swift

@@ -1,54 +1,52 @@
 import UIKit
 
+protocol GroupedDomainDataSourceDelegate: UITableViewController {
+	/// Currently only called when a row is moved and the `tableView` is frontmost.
+	func groupedDomainDataSource(needsUpdate row: Int)
+}
+
 // ##########################
 // #
 // #    MARK: DataSource
 // #
 // ##########################
 
-class GroupedDomainDataSource {
+class GroupedDomainDataSource: FilterPipelineDelegate, SyncUpdateDelegate {
 	
-	private var tsLatest: Timestamp = 0
-	
-	private let parent: String?
-	let pipeline: FilterPipeline<GroupedDomain>
-	private lazy var search = SearchBarManager(on: pipeline.delegate!.tableView)
+	let parent: String?
+	private let pipeline = FilterPipeline<GroupedDomain>()
+	private lazy var search = SearchBarManager(on: delegate!.tableView)
 	private var currentOrder: DateFilterOrderBy = .Date
 	private var orderAsc = false
 	
-	init(withDelegate tvc: FilterPipelineDelegate, parent p: String?) {
-		parent = p
-		pipeline = .init(withDelegate: tvc)
-		pipeline.setDataSource { [unowned self] in self.dataSourceCallback() }
+	/// Will init `sync.allowPullToRefresh()` on `tableView.refreshControl` as well.
+	weak var delegate: GroupedDomainDataSourceDelegate? {
+		willSet { if #available(iOS 10.0, *), newValue !== delegate {
+			sync.allowPullToRefresh(onTVC: newValue, forObserver: self)
+		}}}
+	
+	/// - Note: Will call `tableview.reloadData()`
+	init(withParent: String?) {
+		parent = withParent
+		pipeline.delegate = self
 		resetSortingOrder(force: true)
-		if #available(iOS 10.0, *) {
-			tvc.tableView.refreshControl = UIRefreshControl(call: #selector(reloadFromSource), on: self)
-		}
-		NotifyLogHistoryReset.observe(call: #selector(reloadFromSource), on: self)
+		
 		NotifyDNSFilterChanged.observe(call: #selector(didChangeDomainFilter), on: self)
 		NotifySortOrderChanged.observe(call: #selector(didChangeSortOrder), on: self)
-		NotifySyncInsert.observe(call: #selector(syncInsert), on: self)
-		NotifySyncRemove.observe(call: #selector(syncRemove), on: self)
+		
+		sync.addObserver(self) // calls syncUpdate(reset:)
 	}
 	
-	/// Callback fired only when pipeline resets data source
-	private func dataSourceCallback() -> [GroupedDomain] {
-		guard let db = AppDB else { return [] }
-		let earliest = sync.tsEarliest
-		tsLatest = earliest
-		var log = db.dnsLogsGrouped(since: earliest, parentDomain: parent) ?? []
-		for (i, val) in log.enumerated() {
-			log[i].options = DomainFilter[val.domain]
-			tsLatest = max(tsLatest, val.lastModified)
-		}
-		return log
+	/// Callback fired when user changes date filter settings. (`NotifySortOrderChanged` notification)
+	@objc private func didChangeSortOrder(_ notification: Notification) {
+		resetSortingOrder()
 	}
 	
 	/// Read user defaults and apply new sorting order. Either by setting a new or reversing the current.
 	/// - Parameter force: If `true` set new sorting even if the type does not differ.
 	private func resetSortingOrder(force: Bool = false) {
-		let orderDidChange = (orderAsc =? Pref.DateFilter.OrderAsc)
-		if currentOrder =? Pref.DateFilter.OrderBy || force {
+		let orderDidChange = (orderAsc <-? Pref.DateFilter.OrderAsc)
+		if currentOrder <-? Pref.DateFilter.OrderBy || force {
 			switch currentOrder {
 			case .Date:
 				pipeline.setSorting { [unowned self] in
@@ -68,64 +66,49 @@ class GroupedDomainDataSource {
 		}
 	}
 	
-	/// Pause recurring background updates to force reload `dataSource`.
-	/// Callback fired on user action `pull-to-refresh`, or another background task triggered `NotifyLogHistoryReset`.
-	/// - Parameter sender: May be either `UIRefreshControl` or `Notification`
-	///                     (optional: pass single domain as the notification object).
-	@objc func reloadFromSource(sender: Any? = nil) {
-		weak var refreshControl = sender as? UIRefreshControl
-		let notification = sender as? Notification
-		sync.pause()
-		if let affectedDomain = notification?.object as? String {
-			partiallyReloadFromSource(affectedDomain)
-			sync.continue()
-		} else {
-			pipeline.reload(fromSource: true, whenDone: {
-				sync.syncNow() // sync outstanding entries in cache
-				sync.continue()
-				refreshControl?.endRefreshing()
-			})
-		}
-	}
-	
 	/// Callback fired when user edits list of `blocked` or `ignored` domains in settings. (`NotifyDNSFilterChanged` notification)
 	@objc private func didChangeDomainFilter(_ notification: Notification) {
 		guard let domain = notification.object as? String else {
-			reloadFromSource()
-			return
+			preconditionFailure("Domain independent filter reset not implemented") // `syncUpdate(reset:)` async!
 		}
-		if let (i, obj) = pipeline.dataSourceGet(where: { $0.domain == domain }) {
-			var y = obj
-			y.options = DomainFilter[domain]
-			pipeline.update(y, at: i)
+		if let x = pipeline.dataSourceGet(where: { $0.domain == domain }) {
+			var obj = x.object
+			obj.options = DomainFilter[domain]
+			pipeline.update(obj, at: x.index)
 		}
 	}
 	
-	/// Callback fired when user changes date filter settings. (`NotifySortOrderChanged` notification)
-	@objc private func didChangeSortOrder(_ notification: Notification) {
-		resetSortingOrder()
-	}
-	
 	
 	// MARK: Table View Data Source
 	
 	@inline(__always) var numberOfRows: Int { get { pipeline.displayObjectCount() } }
 	
 	@inline(__always) subscript(_ row: Int) -> GroupedDomain { pipeline.displayObject(at: row) }
+}
+
+
+// ################################
+// #
+// #    MARK: - Partial Update
+// #
+// ################################
+
+extension GroupedDomainDataSource {
 	
+	func syncUpdate(_: SyncUpdate, reset rows: SQLiteRowRange) {
+		var logs = AppDB?.dnsLogsGrouped(range: rows, parentDomain: parent) ?? []
+		for (i, val) in logs.enumerated() {
+			logs[i].options = DomainFilter[val.domain]
+		}
+		pipeline.reset(dataSource: logs)
+	}
 	
-	// MARK: partial updates
-	
-	/// Callback fired when background sync added new entries to the list. (`NotifySyncInsert` notification)
-	@objc private func syncInsert(_ notification: Notification) {
-		sync.pause()
-		defer { sync.continue() }
-		let range = notification.object as! SQLiteRowRange
-		guard let latest = AppDB?.dnsLogsGrouped(range: range, parentDomain: parent) else {
+	func syncUpdate(_: SyncUpdate, insert rows: SQLiteRowRange) {
+		guard let latest = AppDB?.dnsLogsGrouped(range: rows, parentDomain: parent) else {
 			assertionFailure("NotifySyncInsert fired with empty range")
 			return
 		}
-		pipeline.pauseCellAnimations(if: latest.count > 14)
+		cellAnimationsGroup(if: latest.count > 14)
 		for x in latest {
 			if let (i, obj) = pipeline.dataSourceGet(where: { $0.domain == x.domain }) {
 				pipeline.update(obj + x, at: i)
@@ -134,21 +117,16 @@ class GroupedDomainDataSource {
 				y.options = DomainFilter[x.domain]
 				pipeline.addNew(y)
 			}
-			tsLatest = max(tsLatest, x.lastModified)
 		}
-		pipeline.continueCellAnimations(reloadTable: true)
+		cellAnimationsCommit()
 	}
 	
-	/// Callback fired when background sync removed old entries from the list. (`NotifySyncRemove` notification)
-	@objc private func syncRemove(_ notification: Notification) {
-		sync.pause()
-		defer { sync.continue() }
-		let range = notification.object as! SQLiteRowRange
-		guard let outdated = AppDB?.dnsLogsGrouped(range: range, parentDomain: parent),
+	func syncUpdate(_: SyncUpdate, remove rows: SQLiteRowRange) {
+		guard let outdated = AppDB?.dnsLogsGrouped(range: rows, parentDomain: parent),
 			outdated.count > 0 else {
 				return
 		}
-		pipeline.pauseCellAnimations(if: outdated.count > 14)
+		cellAnimationsGroup(if: outdated.count > 14)
 		var listOfDeletes: [Int] = []
 		for x in outdated {
 			guard let (i, obj) = pipeline.dataSourceGet(where: { $0.domain == x.domain }) else {
@@ -162,34 +140,10 @@ class GroupedDomainDataSource {
 			}
 		}
 		pipeline.remove(indices: listOfDeletes.sorted())
-		pipeline.continueCellAnimations(reloadTable: true)
-	}
-}
-
-
-// ################################
-// #
-// #    MARK: - Delete History
-// #
-// ################################
-
-extension GroupedDomainDataSource {
-	
-	/// Callback fired when user performs row edit -> delete action
-	func deleteHistory(domain: String, since ts: Timestamp) {
-		let flag = (parent != nil)
-		DispatchQueue.global().async {
-			guard let db = AppDB, db.dnsLogsDelete(domain, strict: flag, since: ts) > 0 else {
-				return // nothing has changed
-			}
-			db.vacuum()
-			NotifyLogHistoryReset.postAsyncMain(domain) // calls partiallyReloadFromSource(:)
-		}
+		cellAnimationsCommit()
 	}
 	
-	/// Reload a single data source entry. Callback fired by `reloadFromSource()`
-	/// Only useful if `affectedFQDN` currently exists in `dataSource`. Can either update or remove entry.
-	private func partiallyReloadFromSource(_ affectedFQDN: String) {
+	func syncUpdate(_ sender: SyncUpdate, partialRemove affectedFQDN: String) {
 		let affectedParent = affectedFQDN.extractDomain()
 		guard parent == nil || parent == affectedParent else {
 			return // does not affect current table
@@ -199,8 +153,8 @@ extension GroupedDomainDataSource {
 			// can only happen if delete sheet is open while background sync removed the element
 			return
 		}
-		if var updated = AppDB?.dnsLogsGrouped(since: sync.tsEarliest, upto: tsLatest,
-											   matchingDomain: affected, parentDomain: parent)?.first {
+		if var updated = AppDB?.dnsLogsGrouped(range: sender.rows, matchingDomain: affected,
+											   parentDomain: parent)?.first {
 			assert(old.object.domain == updated.domain)
 			updated.options = DomainFilter[updated.domain]
 			pipeline.update(updated, at: old.index)
@@ -211,6 +165,57 @@ extension GroupedDomainDataSource {
 }
 
 
+// #################################
+// #
+// #    MARK: - Cell Animations
+// #
+// #################################
+
+extension GroupedDomainDataSource {
+	/// Sets `pipeline.delegate = nil` to disable individual cell animations (update, insert, delete & move).
+	private func cellAnimationsGroup(if condition: Bool = true) {
+		if condition { pipeline.delegate = nil }
+		if pipeline.delegate != nil {
+			onMain { if !$0.isFrontmost { self.pipeline.delegate = nil } }
+		}
+	}
+	/// No-Op if cell animations are enabled already.
+	/// Else, set `pipeline.delegate = self` and perform `reloadData()`.
+	private func cellAnimationsCommit() {
+		if pipeline.delegate == nil {
+			pipeline.delegate = self
+			onMain { $0.reloadData() }
+		}
+	}
+	/// Perform table view manipulations on main thread.
+	/// Set `delegate = nil` to disable `tableView` animations.
+	private func onMain(_ closure: (UITableView) -> Void) {
+		if Thread.isMainThread {
+			if let tv = delegate?.tableView { closure(tv) }
+		} else {
+			DispatchQueue.main.sync {
+				if let tv = delegate?.tableView { closure(tv) }
+			}
+		}
+	}
+	
+	// TODO: Collect animations and post them in a single animations block.
+	//       This will require enormous work to translate then into a final set.
+	func filterPipelineDidReset() { onMain { $0.reloadData() } }
+	func filterPipeline(delete rows: [Int]) { onMain { $0.safeDeleteRows(rows) } }
+	func filterPipeline(insert row: Int) { onMain { $0.safeInsertRow(row, with: .left) } }
+	func filterPipeline(update row: Int) { onMain { $0.safeReloadRow(row) } }
+	func filterPipeline(move oldRow: Int, to newRow: Int) {
+		onMain {
+			$0.safeMoveRow(oldRow, to: newRow)
+			if $0.isFrontmost { // onMain ensures delegate is set
+				delegate!.groupedDomainDataSource(needsUpdate: newRow)
+			}
+		}
+	}
+}
+
+
 // ################################
 // #
 // #    MARK: - Search
@@ -221,9 +226,9 @@ extension GroupedDomainDataSource {
 	func toggleSearch() {
 		if search.active { search.hide() }
 		else {
-			// Pause animations. Otherwise the `scrollToTop` animation is broken.
+			// Begin animations group. Otherwise the `scrollToTop` animation is broken.
 			// This is due to `addFilter` calling `reloadData()` before `search.show()` can animate it.
-			pipeline.pauseCellAnimations()
+			cellAnimationsGroup()
 			var searchTerm = ""
 			pipeline.addFilter("search") {
 				$0.domain.lowercased().contains(searchTerm)
@@ -234,7 +239,7 @@ extension GroupedDomainDataSource {
 				searchTerm = $0.lowercased()
 				self.pipeline.reloadFilter(withId: "search")
 			})
-			pipeline.continueCellAnimations()
+			cellAnimationsCommit()
 		}
 	}
 }
@@ -246,8 +251,8 @@ extension GroupedDomainDataSource {
 // #
 // ##########################
 
-protocol GroupedDomainEditRow : EditableRows, FilterPipelineDelegate {
-	var source: GroupedDomainDataSource { get set }
+protocol GroupedDomainEditRow : UIViewController, EditableRows {
+	var source: GroupedDomainDataSource { get }
 }
 
 extension GroupedDomainEditRow  {
@@ -274,8 +279,10 @@ extension GroupedDomainEditRow  {
 		case .ignore: showFilterSheet(entry, .ignored)
 		case .block:  showFilterSheet(entry, .blocked)
 		case .delete:
-			AlertDeleteLogs(entry.domain, latest: entry.lastModified) {
-				self.source.deleteHistory(domain: entry.domain, since: $0)
+			let name = entry.domain
+			let flag = (source.parent != nil)
+			AlertDeleteLogs(name, latest: entry.lastModified) {
+				TheGreatDestroyer.deleteLogs(domain: name, since: $0, strict: flag)
 			}.presentIn(self)
 		}
 		return true

main/Data Source/RecordingsDB.swift

@@ -15,8 +15,9 @@ enum RecordingsDB {
 	
 	/// Copy log entries from generic `heap` table  to recording specific `recLog` table
 	static func persist(_ r: Recording) {
-		sync.syncNow() // persist changes in cache before copying recording details
-		AppDB?.recordingLogsPersist(r)
+		sync.syncNow { // persist changes in cache before copying recording details
+			AppDB?.recordingLogsPersist(r)
+		}
 	}
 	
 	/// Get list of domains that occured during the recording

main/Data Source/SyncUpdate.swift

@@ -1,26 +1,63 @@
-import Foundation
+import UIKit
 
 class SyncUpdate {
 	private var lastSync: TimeInterval = 0
 	private var timer: Timer!
 	private var paused: Int = 1 // first start() will decrement
-	private(set) var tsEarliest: Timestamp
+	
+	private var filterType: DateFilterKind
+	private var range: SQLiteRowRange? // written in reloadRangeFromDB()
+	
+	/// Returns invalid range `(-1,-1)` if collection contains no rows
+	var rows: SQLiteRowRange { get { range ?? (-1,-1) } }
+	private(set) var tsEarliest: Timestamp // as set per user, not actual earliest
+	private(set) var tsLatest: Timestamp // as set per user, not actual latest
+	
 	
 	init(periodic interval: TimeInterval) {
-		tsEarliest = Pref.DateFilter.lastXMinTimestamp() ?? 0
+		(filterType, tsEarliest, tsLatest) = Pref.DateFilter.restrictions()
+		reloadRangeFromDB()
+		
 		NotifyDateFilterChanged.observe(call: #selector(didChangeDateFilter), on: self)
 		timer = Timer.repeating(interval, call: #selector(periodicUpdate), on: self)
 		syncNow() // because timer will only fire after interval
 	}
 	
+	/// Callback fired every `7` seconds.
 	@objc private func periodicUpdate() { if paused == 0 { syncNow() } }
 	
+	/// Callback fired when user changes `DateFilter` on root tableView controller
 	@objc private func didChangeDateFilter() {
+		self.pause()
+		let filter = Pref.DateFilter.restrictions()
+		filterType = filter.type
 		DispatchQueue.global().async {
-			self.set(newEarliest: Pref.DateFilter.lastXMinTimestamp() ?? 0)
+			// Not necessary, but improve execution order (delete then insert).
+			if self.tsEarliest <= filter.earliest {
+				self.update(newEarliest: filter.earliest)
+				self.update(newLatest: filter.latest)
+			} else {
+				self.update(newLatest: filter.latest)
+				self.update(newEarliest: filter.earliest)
+			}
+			self.continue()
 		}
 	}
 	
+	/// - Warning: Always call from a background thread!
+	func needsReloadDB(domain: String? = nil) {
+		assert(!Thread.isMainThread)
+		reloadRangeFromDB()
+		if let dom = domain {
+			notifyObservers { $0.syncUpdate(self, partialRemove: dom) }
+		} else {
+			notifyObservers { $0.syncUpdate(self, reset: rows) }
+		}
+	}
+	
+	
+	// MARK: - Sync Now
+	
 	/// This will immediately resume timer updates, ignoring previous `pause()` requests.
 	func start() { paused = 0 }
 	
@@ -37,38 +74,188 @@ class SyncUpdate {
 	/// Determine rows of outdated entries that should be removed and notify observers as well. (`NotifySyncRemove`)
 	/// - Note: This method is rate limited. Sync will be performed at most once per second.
 	/// - Note: This method returns immediatelly. Syncing is done in a background thread.
-	func syncNow() {
+	/// - Parameter block: **Always** called on a background thread!
+	func syncNow(whenDone block: (() -> Void)? = nil) {
 		let now = Date().timeIntervalSince1970
-		guard (now - lastSync) > 1 else { return } // rate limiting
+		guard (now - lastSync) > 1 else { // rate limiting
+			if let b = block { DispatchQueue.global().async { b() } }
+			return
+		}
 		lastSync = now
-		
+		self.pause() // reduce concurrent load
 		DispatchQueue.global().async {
-			self.pause() // reduce concurrent load
-			
-			if let inserted = AppDB?.dnsLogsPersist() { // move cache -> heap
-				NotifySyncInsert.postAsyncMain(inserted)
-			}
-			if let lastXFilter = Pref.DateFilter.lastXMinTimestamp() {
-				self.set(newEarliest: lastXFilter)
-			}
-			// TODO: periodic hard delete old logs (will reset rowids!)
-			
+			self.internalSync()
+			block?()
 			self.continue()
 		}
 	}
 	
+	/// Called by `syncNow()`. Split to a separate func to reduce `self.` cluttering
+	private func internalSync() {
+		assert(!Thread.isMainThread)
+		// Always persist logs ...
+		if let inserted = AppDB?.dnsLogsPersist() { // move cache -> heap
+			if filterType == .ABRange {
+				// ... even if we filter a few later
+				publishInsert(front: false, tsEarliest, tsLatest + 1, scope: inserted)
+			} else {
+				safeSetRange(end: inserted)
+				notifyObservers { $0.syncUpdate(self, insert: inserted) }
+			}
+		}
+		if filterType == .LastXMin {
+			update(newEarliest: Timestamp.past(minutes: Pref.DateFilter.LastXMin))
+		}
+		// TODO: periodic hard delete old logs (will reset rowids!)
+	}
+	
+	
+	// MARK: - Internal
+	
+	private func reloadRangeFromDB() {
+		// `nil` is not SQLiteRowRange(0,0) aka. full collection.
+		// `nil` means invalid range. e.g. ts restriction too high or empty db.
+		range = AppDB?.dnsLogsRowRange(between: tsEarliest, and: tsLatest + 1)
+	}
+	
+	/// Helper to always set range in case there was none before. Otherwise only update `start`.
+	private func safeSetRange(start r: SQLiteRowRange) {
+		range == nil ? (range = r) : (range!.start = r.start)
+	}
+	
+	/// Helper to always set range in case there was none before. Otherwise only update `end`.
+	private func safeSetRange(end r: SQLiteRowRange) {
+		range == nil ? (range = r) : (range!.end = r.end)
+	}
+	
+	/// Update internal `tsEarliest`, then post `NotifySyncInsert` or `NotifySyncRemove` notification with row ids.
 	/// - Warning: Always call from a background thread!
-	private func set(newEarliest: Timestamp) {
-		let current = tsEarliest
-		tsEarliest = newEarliest
-		if current < newEarliest {
-			if let excess = AppDB?.dnsLogsRowRange(between: current, and: newEarliest) {
-				NotifySyncRemove.postAsyncMain(excess)
+	private func update(newEarliest: Timestamp) {
+		if let (old, new) = tsEarliest <-/ newEarliest {
+			if new < old {
+				publishInsert(front: true, new, (tsLatest == -1 ? old : min(old, tsLatest + 1)), scope: (0, range?.start ?? 0))
+			} else if range != nil {
+				publishRemove(front: true, old, (tsLatest == -1 ? new : min(new, tsLatest + 1)), scope: range!)
 			}
-		} else if current > newEarliest {
-			if let missing = AppDB?.dnsLogsRowRange(between: newEarliest, and: current) {
-				NotifySyncInsert.postAsyncMain(missing)
+		}
+	}
+	
+	/// Update internal `tsLatest`, then post `NotifySyncInsert` or `NotifySyncRemove` notification with row ids.
+	/// - Warning: Always call from a background thread!
+	private func update(newLatest: Timestamp) {
+		if let (old, new) = tsLatest <-/ newLatest {
+			// +1: include upper end because `dnsLogsRowRange` selects `ts < X`
+			if (old < new || new == -1), old != -1 {
+				publishInsert(front: false, max(old + 1, tsEarliest), new + 1, scope: (range?.end ?? 0, 0))
+			} else if range != nil {
+				// FIXME: removing latest entries will invalidate "last changed" label
+				publishRemove(front: false, max(new + 1, tsEarliest), old + 1, scope: range!)
 			}
-		} // else: nothing changed
+		}
+	}
+	
+	/// - Warning: Always call from a background thread!
+	private func publishInsert(front: Bool, _ ts1: Timestamp, _ ts2: Timestamp, scope: SQLiteRowRange) {
+		if let r = AppDB?.dnsLogsRowRange(between: ts1, and: ts2, within: scope) {
+			front ? safeSetRange(start: r) : safeSetRange(end: r)
+			notifyObservers { $0.syncUpdate(self, insert: r) }
+		}
+	}
+	
+	/// - Warning: `range` must not be `nil`!
+	/// - Warning: Always call from a background thread!
+	private func publishRemove(front: Bool, _ ts1: Timestamp, _ ts2: Timestamp, scope: SQLiteRowRange) {
+		assert(range != nil)
+		if let r = AppDB?.dnsLogsRowRange(between: ts1, and: ts2, within: scope) {
+			front ? (range!.start = r.end + 1) : (range!.end = r.start - 1)
+			if range!.start > range!.end { range = nil }
+			notifyObservers { $0.syncUpdate(self, remove: r) }
+		}
+	}
+	
+	
+	// MARK: - Observer List
+	
+	private var observers: [WeakObserver] = []
+	
+	/// Add `delegate` to observer list and immediatelly call `syncUpdate(reset:)` (on background thread).
+	func addObserver(_ delegate: SyncUpdateDelegate) {
+		observers.removeAll { $0.target == nil }
+		observers.append(.init(target: delegate))
+		DispatchQueue.global().async {
+			delegate.syncUpdate(self, reset: self.rows)
+		}
+	}
+	
+	/// - Warning: Always call from a background thread!
+	private func notifyObservers(_ block: (SyncUpdateDelegate) -> Void) {
+		assert(!Thread.isMainThread)
+		self.pause()
+		for o in observers where o.target != nil { block(o.target!) }
+		self.continue()
+	}
+}
+
+/// Wrapper class for `SyncUpdateDelegate` that supports weak references
+private struct WeakObserver {
+	weak var target: SyncUpdateDelegate?
+	weak var pullToRefresh: UIRefreshControl?
+}
+
+protocol SyncUpdateDelegate : AnyObject {
+	/// `SyncUpdate` has unpredictable changes. Reload your `dataSource`.
+	/// - Warning: This function will **always** be called from a background thread.
+	func syncUpdate(_ sender: SyncUpdate, reset rows: SQLiteRowRange)
+	
+	/// `SyncUpdate` added new `rows` to database. Sync changes to your `dataSource`.
+	/// - Warning: This function will **always** be called from a background thread.
+	func syncUpdate(_ sender: SyncUpdate, insert rows: SQLiteRowRange)
+	
+	/// `SyncUpdate` outdated some `rows` in database. Sync changes to your `dataSource`.
+	/// - Warning: This function will **always** be called from a background thread.
+	func syncUpdate(_ sender: SyncUpdate, remove rows: SQLiteRowRange)
+	
+	/// Background process did delete some entries in database that match `affectedDomain`.
+	/// Update or remove entries from your `dataSource`.
+	/// - Warning: This function will **always** be called from a background thread.
+	func syncUpdate(_ sender: SyncUpdate, partialRemove affectedDomain: String)
+}
+
+
+// MARK: - Pull-To-Refresh
+
+@available(iOS 10.0, *)
+extension SyncUpdate {
+	
+	/// Add Pull-To-Refresh control to `tableViewController`. On action notify `observer.syncUpdate(reset:)`
+	/// - Warning: Must be called after `addObserver()` such that `observer` exists in list of observers.
+	func allowPullToRefresh(onTVC tableViewController: UITableViewController?, forObserver: SyncUpdateDelegate) {
+		guard let i = observers.firstIndex(where: { $0.target === forObserver }) else {
+			assertionFailure("You must add the observer before enabling Pull-To-Refresh!")
+			return
+		}
+		// remove previous
+		observers[i].pullToRefresh?.removeTarget(self, action: #selector(pullToRefresh), for: .valueChanged)
+		observers[i].pullToRefresh = nil
+		if let tvc = tableViewController {
+			let rc = UIRefreshControl()
+			rc.addTarget(self, action: #selector(pullToRefresh), for: .valueChanged)
+			tvc.tableView.refreshControl = rc
+			observers[i].pullToRefresh = rc
+		}
+	}
+	
+	/// Pull-To-Refresh callback method. Find observer with corresponding `RefreshControl` and notify `syncUpdate(reset:)`
+	@objc private func pullToRefresh(sender: UIRefreshControl) {
+		guard let x = observers.first(where: { $0.pullToRefresh === sender }) else {
+			assertionFailure("Should never happen. RefreshControl removed from table view while keeping it active somewhere else.")
+			return
+		}
+		syncNow {
+			x.target?.syncUpdate(self, reset: self.rows)
+			DispatchQueue.main.sync {
+				sender.endRefreshing()
+			}
+		}
 	}
 }

main/Extensions/Generic.swift

@@ -27,15 +27,34 @@ extension UIEdgeInsets {
 	}
 }
 
-infix operator =? : ComparisonPrecedence
+precedencegroup CompareAssignPrecedence {
+	assignment: true
+	associativity: left
+	higherThan: ComparisonPrecedence
+}
+
+infix operator <-? : CompareAssignPrecedence
+infix operator <-/ : CompareAssignPrecedence
 extension Equatable {
-	/// Assign a new value to `lhs` if the `newValue` differs from the previous value. Return whether the new value was set.
+	/// Assign a new value to `lhs` if `newValue` differs from the previous value. Return `false` if they are equal.
 	/// - Returns: `true` if `lhs` was overwritten with another value
-	static func =?(lhs: inout Self, newValue: Self) -> Bool {
+	static func <-?(lhs: inout Self, newValue: Self) -> Bool {
 		if lhs != newValue {
 			lhs = newValue
 			return true
 		}
 		return false
 	}
+	
+	/// Assign a new value to `lhs` if `newValue` differs from the previous value.
+	/// Return tuple with both values. Or `nil` if they are equal.
+	/// - Returns: `nil` if `previousValue == newValue`
+	static func <-/(lhs: inout Self, newValue: Self) -> (previousValue: Self, newValue: Self)? {
+		let previousValue = lhs
+		if previousValue != newValue {
+			lhs = newValue
+			return (previousValue, newValue)
+		}
+		return nil
+	}
 }

main/Extensions/Notifications.swift

@@ -1,12 +1,9 @@
 import Foundation
 
 let NotifyVPNStateChanged = NSNotification.Name("GlassVPNStateChanged") // VPNState!
-let NotifyDNSFilterChanged = NSNotification.Name("PSIDNSFilterSettingsChanged") // domain: String?
+let NotifyDNSFilterChanged = NSNotification.Name("PSIDNSFilterSettingsChanged") // domain: String!
 let NotifyDateFilterChanged = NSNotification.Name("PSIDateFilterSettingsChanged") // nil!
 let NotifySortOrderChanged = NSNotification.Name("PSIDateFilterSortOrderChanged") // nil!
-let NotifyLogHistoryReset = NSNotification.Name("PSILogHistoryReset") // domain: String?
-let NotifySyncInsert = NSNotification.Name("PSISyncInsert") // SQLiteRowRange!
-let NotifySyncRemove = NSNotification.Name("PSISyncRemove") // SQLiteRowRange!
 let NotifyRecordingChanged = NSNotification.Name("PSIRecordingChanged") // (Recording, deleted: Bool)!
 
 

main/Extensions/SharedState.swift

@@ -7,13 +7,15 @@ public enum VPNState : Int {
 	case on = 1, inbetween, off
 }
 
-struct Pref {
+enum Pref {
 	static func Int(_ key: String) -> Int { UserDefaults.standard.integer(forKey: key) }
 	static func Int(_ val: Int, _ key: String) { UserDefaults.standard.set(val, forKey: key) }
 	static func Bool(_ key: String) -> Bool { UserDefaults.standard.bool(forKey: key) }
 	static func Bool(_ val: Bool, _ key: String) { UserDefaults.standard.set(val, forKey: key) }
+	static func `Any`(_ key: String) -> Any? { UserDefaults.standard.object(forKey: key) }
+	static func `Any`(_ val: Any?, _ key: String) { UserDefaults.standard.set(val, forKey: key) }
 	
-	struct DidShowTutorial {
+	enum DidShowTutorial {
 		static var Welcome: Bool {
 			get { Pref.Bool("didShowTutorialAppWelcome") }
 			set { Pref.Bool(newValue, "didShowTutorialAppWelcome") }
@@ -23,7 +25,7 @@ struct Pref {
 			set { Pref.Bool(newValue, "didShowTutorialRecordings") }
 		}
 	}
-	struct DateFilter {
+	enum DateFilter {
 		static var Kind: DateFilterKind {
 			get { DateFilterKind(rawValue: Pref.Int("dateFilterType"))! }
 			set { Pref.Int(newValue.rawValue, "dateFilterType") }
@@ -33,6 +35,16 @@ struct Pref {
 			get { Pref.Int("dateFilterLastXMin") }
 			set { Pref.Int(newValue, "dateFilterLastXMin") }
 		}
+		/// Default: `nil` (disabled)
+		static var RangeA: Timestamp? {
+			get { Pref.Any("dateFilterRangeA") as? Timestamp }
+			set { Pref.Any(newValue, "dateFilterRangeA") }
+		}
+		/// Default: `nil` (disabled)
+		static var RangeB: Timestamp? {
+			get { Pref.Any("dateFilterRangeB") as? Timestamp }
+			set { Pref.Any(newValue, "dateFilterRangeB") }
+		}
 		/// default: `.Date`
 		static var OrderBy: DateFilterOrderBy {
 			get { DateFilterOrderBy(rawValue: Pref.Int("dateFilterOderType"))! }
@@ -44,11 +56,17 @@ struct Pref {
 			set { Pref.Bool(newValue, "dateFilterOderAsc") }
 		}
 		
-		/// Return selected timestamp filter or `nil` if filtering is disabled.
-		/// - Returns: `Timestamp.now() - LastXMin * 60`
-		static func lastXMinTimestamp() -> Timestamp? {
-			if Kind != .LastXMin { return nil }
-			return Timestamp.past(minutes: Pref.DateFilter.LastXMin)
+		/// - Returns: Timestamp restriction depending on current selected date filter.
+		///   - `Off` : `(0, -1)`
+		///   - `LastXMin` : `(now-LastXMin, -1)`
+		///   - `ABRange` : `(RangeA, RangeB)`
+		static func restrictions() -> (type: DateFilterKind, earliest: Timestamp, latest: Timestamp) {
+			let type = Kind
+			switch type {
+			case .Off:      return (type, 0, -1)
+			case .LastXMin: return (type, Timestamp.past(minutes: Pref.DateFilter.LastXMin), -1)
+			case .ABRange:  return (type, Pref.DateFilter.RangeA ?? 0, Pref.DateFilter.RangeB ?? -1)
+			}
 		}
 	}
 }

main/Extensions/String.swift

@@ -36,7 +36,7 @@ extension String {
 	}
 }
 
-var listOfSLDs: [String : [String : Bool]] = {
+private var listOfSLDs: [String : [String : Bool]] = {
 	let path = Bundle.main.url(forResource: "third-level", withExtension: "txt")
 	let content = try! String(contentsOf: path!)
 	var res: [String : [String : Bool]] = [:]

main/Requests/TVCDomains.swift

@@ -1,8 +1,8 @@
 import UIKit
 
-class TVCDomains: UITableViewController, UISearchBarDelegate, FilterPipelineDelegate {
+class TVCDomains: UITableViewController, UISearchBarDelegate, GroupedDomainDataSourceDelegate {
 	
-	lazy var source = GroupedDomainDataSource(withDelegate: self, parent: nil)
+	lazy var source = GroupedDomainDataSource(withParent: nil)
 	
 	@IBOutlet private var filterButton: UIBarButtonItem!
 	@IBOutlet private var filterButtonDetail: UIBarButtonItem!
@@ -11,14 +11,7 @@ class TVCDomains: UITableViewController, UISearchBarDelegate, FilterPipelineDele
 		super.viewDidLoad()
 		NotifyDateFilterChanged.observe(call: #selector(didChangeDateFilter), on: self)
 		didChangeDateFilter()
-	}
-	
-	private var didLoadAlready = false
-	override func viewDidAppear(_ animated: Bool) {
-		if !didLoadAlready {
-			didLoadAlready = true
-			source.reloadFromSource()
-		}
+		source.delegate = self // init lazy var, ready for tableView data source
 	}
 	
 	override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
@@ -76,7 +69,7 @@ class TVCDomains: UITableViewController, UISearchBarDelegate, FilterPipelineDele
 		return cell
 	}
 	
-	func rowNeedsUpdate(_ row: Int) {
+	func groupedDomainDataSource(needsUpdate row: Int) {
 		let entry = source[row]
 		let cell = tableView.cellForRow(at: IndexPath(row: row))
 		cell?.detailTextLabel?.text = entry.detailCellText

main/Requests/TVCHostDetails.swift

@@ -1,62 +1,16 @@
 import UIKit
 
-class TVCHostDetails: UITableViewController {
+class TVCHostDetails: UITableViewController, SyncUpdateDelegate {
 
 	public var fullDomain: String!
 	private var dataSource: [GroupedTsOccurrence] = []
 	
 	override func viewDidLoad() {
-		super.viewDidLoad()
 		navigationItem.prompt = fullDomain
+		super.viewDidLoad()
+		sync.addObserver(self) // calls `syncUpdate(reset:)`
 		if #available(iOS 10.0, *) {
-			tableView.refreshControl = UIRefreshControl(call: #selector(reloadDataSource), on: self)
-		}
-		NotifyLogHistoryReset.observe(call: #selector(reloadDataSource), on: self)
-		NotifySyncInsert.observe(call: #selector(syncInsert), on: self)
-		NotifySyncRemove.observe(call: #selector(syncRemove), on: self)
-		reloadDataSource()
-	}
-	
-	@objc func reloadDataSource(sender: Any? = nil) {
-		let refreshControl = sender as? UIRefreshControl
-		let notification = sender as? Notification
-		if let affectedDomain = notification?.object as? String {
-			guard fullDomain.isSubdomain(of: affectedDomain) else { return }
-		}
-		DispatchQueue.global().async { [weak self] in
-			self?.dataSource = AppDB?.timesForDomain(self?.fullDomain ?? "", since: sync.tsEarliest) ?? []
-			DispatchQueue.main.sync {
-				self?.tableView.reloadData()
-				sync.syncNow() // sync outstanding entries in cache
-				refreshControl?.endRefreshing()
-			}
-		}
-	}
-	
-	@objc private func syncInsert(_ notification: Notification) {
-		let range = notification.object as! SQLiteRowRange
-		if let latest = AppDB?.timesForDomain(fullDomain, range: range), latest.count > 0 {
-			dataSource.insert(contentsOf: latest, at: 0)
-			if tableView.isFrontmost {
-				let indices = (0..<latest.count).map { IndexPath(row: $0) }
-				tableView.insertRows(at: indices, with: .left)
-			} else {
-				tableView.reloadData()
-			}
-		}
-	}
-	
-	@objc private func syncRemove(_ notification: Notification) {
-		let earliest = sync.tsEarliest
-		if let i = dataSource.firstIndex(where: { $0.ts < earliest }) {
-			// since they are ordered, we can optimize
-			let indices = (i..<dataSource.endIndex).map { IndexPath(row: $0) }
-			dataSource.removeLast(dataSource.count - i)
-			if tableView.isFrontmost {
-				tableView.deleteRows(at: indices, with: .automatic)
-			} else {
-				tableView.reloadData()
-			}
+			sync.allowPullToRefresh(onTVC: self, forObserver: self)
 		}
 	}
 	
@@ -73,3 +27,55 @@ class TVCHostDetails: UITableViewController {
 		return cell
 	}
 }
+
+// ################################
+// #
+// #    MARK: - Partial Update
+// #
+// ################################
+
+extension TVCHostDetails {
+	
+	func syncUpdate(_ _: SyncUpdate, reset rows: SQLiteRowRange) {
+		dataSource = AppDB?.timesForDomain(fullDomain, range: rows) ?? []
+		DispatchQueue.main.sync { tableView.reloadData() }
+	}
+	
+	func syncUpdate(_ _: SyncUpdate, insert rows: SQLiteRowRange) {
+		guard let latest = AppDB?.timesForDomain(fullDomain, range: rows), latest.count > 0 else {
+			return
+		}
+		// TODO: if filter will be ever editable at this point, we cannot insert at 0
+		dataSource.insert(contentsOf: latest, at: 0)
+		DispatchQueue.main.sync {
+			if tableView.isFrontmost {
+				let indices = (0..<latest.count).map { IndexPath(row: $0) }
+				tableView.insertRows(at: indices, with: .left)
+			} else {
+				tableView.reloadData()
+			}
+		}
+	}
+	
+	func syncUpdate(_ sender: SyncUpdate, remove _: SQLiteRowRange) {
+		let earliest = sender.tsEarliest
+		let latest = sender.tsLatest
+		// Assuming they are ordered by ts and in descending order
+		if let i = dataSource.lastIndex(where: { $0.ts >= earliest }), (i+1) < dataSource.count {
+			let indices = ((i+1)..<dataSource.endIndex).map{ $0 }
+			dataSource.removeLast(dataSource.count - (i+1))
+			DispatchQueue.main.sync { tableView.safeDeleteRows(indices) }
+		}
+		if let i = dataSource.firstIndex(where: { $0.ts <= latest }), i > 0 {
+			let indices = (dataSource.startIndex..<i).map{ $0 }
+			dataSource.removeFirst(i)
+			DispatchQueue.main.sync { tableView.safeDeleteRows(indices) }
+		}
+	}
+	
+	func syncUpdate(_ sender: SyncUpdate, partialRemove affectedDomain: String) {
+		if fullDomain.isSubdomain(of: affectedDomain) {
+			syncUpdate(sender, reset: sender.rows)
+		}
+	}
+}

main/Requests/TVCHosts.swift

@@ -1,17 +1,17 @@
 import UIKit
 
-class TVCHosts: UITableViewController, FilterPipelineDelegate {
+class TVCHosts: UITableViewController, GroupedDomainDataSourceDelegate {
 	
-	lazy var source = GroupedDomainDataSource(withDelegate: self, parent: parentDomain)
+	lazy var source = GroupedDomainDataSource(withParent: parentDomain)
 	
 	public var parentDomain: String!
 	private var isSpecial: Bool = false
 	
 	override func viewDidLoad() {
-		super.viewDidLoad()
 		navigationItem.prompt = parentDomain
+		super.viewDidLoad()
 		isSpecial = (parentDomain.first == "#") // aka: "# IP address"
-		source.reloadFromSource() // init lazy var
+		source.delegate = self // init lazy var, ready for tableView data source
 	}
 	
 	override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
@@ -45,7 +45,7 @@ class TVCHosts: UITableViewController, FilterPipelineDelegate {
 		return cell
 	}
 	
-	func rowNeedsUpdate(_ row: Int) {
+	func groupedDomainDataSource(needsUpdate row: Int) {
 		let entry = source[row]
 		let cell = tableView.cellForRow(at: IndexPath(row: row))
 		cell?.detailTextLabel?.text = entry.detailCellText

main/Requests/VCDateFilter.swift

@@ -18,8 +18,8 @@ class VCDateFilter: UIViewController, UIGestureRecognizerDelegate {
 	@IBOutlet private var rangeView: UIView!
 	@IBOutlet private var buttonRangeStart: UIButton!
 	@IBOutlet private var buttonRangeEnd: UIButton!
-	private lazy var tsRangeA: Timestamp = AppDB?.dnsLogsMinDate() ?? 0
-	private lazy var tsRangeB: Timestamp = .now()
+	private lazy var tsRangeA: Timestamp = Pref.DateFilter.RangeA ?? AppDB?.dnsLogsMinDate() ?? .now()
+	private lazy var tsRangeB: Timestamp = Pref.DateFilter.RangeB ?? .now()
 	
 	// order by
 	@IBOutlet private var orderbyType: UISegmentedControl!
@@ -31,15 +31,11 @@ class VCDateFilter: UIViewController, UIGestureRecognizerDelegate {
 		
 		filterBy.selectedSegmentIndex = (Pref.DateFilter.Kind == .ABRange ? 1 : 0)
 		didChangeFilterBy(filterBy)
-		filterBy.setEnabled(false, forSegmentAt: 1) // TODO: until range filter is ready
 		
 		durationSlider.tag = -1 // otherwise wont update because `tag == 0`
 		durationSlider.value = Float(durationTimes.firstIndex(of: Pref.DateFilter.LastXMin) ?? 0) / 9
 		durationSliderChanged(durationSlider)
 		
-		// Force set seconds to 00 and 59 respectively. Its retained during change.
-		tsRangeA = tsRangeA - tsRangeA % 60 + 00
-		tsRangeB = tsRangeB - tsRangeB % 60 + 59
 		buttonRangeStart.setTitle(DateFormat.minutes(tsRangeA), for: .normal)
 		buttonRangeEnd.setTitle(DateFormat.minutes(tsRangeB), for: .normal)
 		
@@ -70,45 +66,57 @@ class VCDateFilter: UIViewController, UIGestureRecognizerDelegate {
 		DatePickerAlert(presentIn: self, configure: {
 			$0.setDate(Date(flag ? self.tsRangeA : self.tsRangeB), animated: false)
 		}, onSuccess: {
-			flag ? (self.tsRangeA = $0.timestamp) : (self.tsRangeB = $0.timestamp)
-			sender.setTitle(DateFormat.minutes($0), for: .normal)
+			var ts = $0.timestamp
+			ts -= ts % 60 // remove seconds
+			// if one of these is greater than the other, adjust the latter too.
+			if flag || self.tsRangeA > ts {
+				self.tsRangeA = ts // lower end of minute
+				self.buttonRangeStart.setTitle(DateFormat.minutes(ts), for: .normal)
+			}
+			if !flag || ts > self.tsRangeB {
+				self.tsRangeB = ts + 59 // upper end of minute
+				self.buttonRangeEnd.setTitle(DateFormat.minutes(ts + 59), for: .normal)
+			}
 		})
 	}
 	
 	func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
-		if gestureRecognizer.view == touch.view {
-			let newXMin = durationSlider.tag
-			let filterType: DateFilterKind
-			let orderType: DateFilterOrderBy
-			
-			switch filterBy.selectedSegmentIndex {
-			case 0: filterType = (newXMin > 0) ? .LastXMin : .Off
-			case 1: filterType = .ABRange
-			default: preconditionFailure()
-			}
-			switch orderbyType.selectedSegmentIndex {
-			case 0: orderType = .Date
-			case 1: orderType = .Name
-			case 2: orderType = .Count
-			default: preconditionFailure()
-			}
-			sync.pause()
-			let orderAsc = (orderbyAsc.selectedSegmentIndex == 0)
-			if Pref.DateFilter.OrderBy != orderType || Pref.DateFilter.OrderAsc != orderAsc {
-				Pref.DateFilter.OrderBy = orderType
-				Pref.DateFilter.OrderAsc = orderAsc
-				NotifySortOrderChanged.post()
-			}
-			if Pref.DateFilter.Kind != filterType || Pref.DateFilter.LastXMin != newXMin {
-				Pref.DateFilter.Kind = filterType
-				Pref.DateFilter.LastXMin = newXMin
-				NotifyDateFilterChanged.post()
-			}
-			sync.continue()
+		if gestureRecognizer.view === touch.view {
+			saveSettings()
 			dismiss(animated: true)
 		}
 		return false
 	}
+	
+	private func saveSettings() {
+		let newXMin = durationSlider.tag
+		let filterType: DateFilterKind
+		let orderType: DateFilterOrderBy
+		
+		switch filterBy.selectedSegmentIndex {
+		case 0: filterType = (newXMin > 0) ? .LastXMin : .Off
+		case 1: filterType = .ABRange
+		default: preconditionFailure()
+		}
+		switch orderbyType.selectedSegmentIndex {
+		case 0: orderType = .Date
+		case 1: orderType = .Name
+		case 2: orderType = .Count
+		default: preconditionFailure()
+		}
+		let a = Pref.DateFilter.OrderBy <-? orderType
+		let b = Pref.DateFilter.OrderAsc <-? (orderbyAsc.selectedSegmentIndex == 0)
+		if a || b {
+			NotifySortOrderChanged.post()
+		}
+		let c = Pref.DateFilter.Kind <-? filterType
+		let d = Pref.DateFilter.LastXMin <-? newXMin
+		let e = Pref.DateFilter.RangeA <-? (filterType == .ABRange ? tsRangeA : nil)
+		let f = Pref.DateFilter.RangeB <-? (filterType == .ABRange ? tsRangeB : nil)
+		if c || d || e || f {
+			NotifyDateFilterChanged.post()
+		}
+	}
 }
 
 

main/Settings/TVCFilter.swift

@@ -2,23 +2,16 @@ import UIKit
 
 class TVCFilter: UITableViewController, EditActionsRemove {
 	var currentFilter: FilterOptions = .none // set by segue
-	private var dataSource: [String] = []
+	private lazy var dataSource = DomainFilter.list(where: currentFilter)
 	
 	override func viewDidLoad() {
 		super.viewDidLoad()
 		NotifyDNSFilterChanged.observe(call: #selector(didChangeDomainFilter), on: self)
-		reloadDataSource()
-	}
-
-	func reloadDataSource() {
-		dataSource = DomainFilter.list(where: currentFilter)
-		tableView.reloadData()
 	}
 	
 	@objc func didChangeDomainFilter(_ notification: Notification) {
 		guard let domain = notification.object as? String else {
-			reloadDataSource()
-			return
+			preconditionFailure("Domain independent filter reset not implemented")
 		}
 		if DomainFilter[domain]?.contains(currentFilter) ?? false {
 			let i = dataSource.binTreeIndex(of: domain, compare: (<))!

main/Settings/TVCSettings.swift

@@ -42,10 +42,7 @@ class TVCSettings: UITableViewController {
 			"You are about to delete all results that have been logged in the past. " +
 			"Your preferences for blocked and ignored domains are preserved.\n" +
 			"Continue?", buttonText: "Delete", buttonStyle: .destructive) { _ in
-				DispatchQueue.global().async {
-					try? AppDB?.dnsLogsDeleteAll()
-					NotifyLogHistoryReset.postAsyncMain()
-				}
+				TheGreatDestroyer.deleteAllLogs()
 		}.presentIn(self)
 	}