Move local modules into a folder named Modules.

Modules/SyncDatabase/Sources/SyncDatabase/Constants.swift

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+//
+//  Constants.swift
+//  SyncDatabase
+//
+//  Created by Maurice Parker on 5/14/19.
+//  Copyright © 2019 Ranchero Software. All rights reserved.
+//
+
+import Foundation
+
+struct DatabaseTableName {
+	
+	static let syncStatus = "syncStatus"
+}
+
+struct DatabaseKey {
+	
+	// Sync Status
+	static let articleID = "articleID"
+	static let key = "key"
+	static let flag = "flag"
+	static let selected = "selected"
+}

Modules/SyncDatabase/Sources/SyncDatabase/SyncDatabase.swift

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+//
+//  SyncDatabase.swift
+//  NetNewsWire
+//
+//  Created by Maurice Parker on 5/14/19.
+//  Copyright © 2019 Ranchero Software. All rights reserved.
+//
+
+import Foundation
+import Database
+import FMDB
+
+public actor SyncDatabase {
+
+	private var database: FMDatabase?
+	private var databasePath: String
+	private let syncStatusTable = SyncStatusTable()
+
+	public init(databasePath: String) {
+
+		let database = FMDatabase.openAndSetUpDatabase(path: databasePath)
+		database.runCreateStatements(Self.creationStatements)
+		database.vacuum()
+
+		self.database = database
+		self.databasePath = databasePath
+	}
+
+	// MARK: - API
+
+	public func insertStatuses(_ statuses: Set<SyncStatus>) throws {
+		
+		guard let database else {
+			throw DatabaseError.suspended
+		}
+		syncStatusTable.insertStatuses(statuses, database: database)
+	}
+	
+	public func selectForProcessing(limit: Int? = nil) throws -> Set<SyncStatus>? {
+
+		guard let database else {
+			throw DatabaseError.suspended
+		}
+		return syncStatusTable.selectForProcessing(limit: limit, database: database)
+	}
+
+	public func selectPendingCount() throws -> Int? {
+
+		guard let database else {
+			throw DatabaseError.suspended
+		}
+		return syncStatusTable.selectPendingCount(database: database)
+	}
+	
+	public func selectPendingReadStatusArticleIDs() throws -> Set<String>? {
+
+		guard let database else {
+			throw DatabaseError.suspended
+		}
+		return syncStatusTable.selectPendingReadStatusArticleIDs(database: database)
+	}
+
+	public func selectPendingStarredStatusArticleIDs() throws -> Set<String>? {
+
+		guard let database else {
+			throw DatabaseError.suspended
+		}
+		return syncStatusTable.selectPendingStarredStatusArticleIDs(database: database)
+	}
+
+	public func resetAllSelectedForProcessing() throws {
+
+		guard let database else {
+			throw DatabaseError.suspended
+		}
+		syncStatusTable.resetAllSelectedForProcessing(database: database)
+	}
+
+	public func resetSelectedForProcessing(_ articleIDs: Set<String>) throws {
+
+		guard let database else {
+			throw DatabaseError.suspended
+		}
+		syncStatusTable.resetSelectedForProcessing(articleIDs, database: database)
+	}
+	
+    public func deleteSelectedForProcessing(_ articleIDs: Set<String>) throws {
+
+		guard let database else {
+			throw DatabaseError.suspended
+		}
+		syncStatusTable.deleteSelectedForProcessing(articleIDs, database: database)
+	}
+
+	// MARK: - Suspend and Resume (for iOS)
+
+	public func suspend() {
+#if os(iOS)
+		database?.close()
+		database = nil
+#endif
+	}
+
+	public func resume() {
+#if os(iOS)
+		if database == nil {
+			self.database = FMDatabase.openAndSetUpDatabase(path: databasePath)
+		}
+#endif
+	}
+}
+
+private extension SyncDatabase {
+
+	static let creationStatements = """
+ CREATE TABLE if not EXISTS syncStatus (articleID TEXT NOT NULL, key TEXT NOT NULL, flag BOOL NOT NULL DEFAULT 0, selected BOOL NOT NULL DEFAULT 0, PRIMARY KEY (articleID, key));
+ """
+
+}

Modules/SyncDatabase/Sources/SyncDatabase/SyncStatus.swift

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+//
+//  SyncStatus.swift
+//  NetNewsWire
+//
+//  Created by Maurice Parker on 5/14/19.
+//  Copyright © 2019 Ranchero Software. All rights reserved.
+//
+
+import Foundation
+import Articles
+import Database
+
+public struct SyncStatus: Hashable, Equatable, Sendable {
+
+	public enum Key: String, Sendable {
+		case read = "read"
+		case starred = "starred"
+		case deleted = "deleted"
+		case new = "new"
+		
+		public init(_ articleStatusKey: ArticleStatus.Key) {
+			switch articleStatusKey {
+			case .read:
+				self = Self.read
+			case .starred:
+				self = Self.starred
+			}
+		}
+		
+	}
+
+	public let articleID: String
+	public let key: SyncStatus.Key
+	public let flag: Bool
+	public let selected: Bool
+	
+	public init(articleID: String, key: SyncStatus.Key, flag: Bool, selected: Bool = false) {
+		self.articleID = articleID
+		self.key = key
+		self.flag = flag
+		self.selected = selected
+	}
+	
+	public func databaseDictionary() -> DatabaseDictionary {
+		return [DatabaseKey.articleID: articleID, DatabaseKey.key: key.rawValue, DatabaseKey.flag: flag, DatabaseKey.selected: selected]
+	}
+
+	public func hash(into hasher: inout Hasher) {
+		hasher.combine(articleID)
+		hasher.combine(key)
+	}
+}

Modules/SyncDatabase/Sources/SyncDatabase/SyncStatusTable.swift

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+//
+//  SyncStatusTable.swift
+//  NetNewsWire
+//
+//  Created by Maurice Parker on 5/14/19.
+//  Copyright © 2019 Ranchero Software. All rights reserved.
+//
+
+import Foundation
+import Articles
+import Database
+import FMDB
+
+struct SyncStatusTable {
+
+	static private let name = "syncStatus"
+
+	func selectForProcessing(limit: Int?, database: FMDatabase) -> Set<SyncStatus>? {
+
+		let updateSQL = "update syncStatus set selected = true"
+		database.executeUpdateInTransaction(updateSQL, withArgumentsIn: nil)
+
+		let selectSQL = {
+			var sql = "select * from syncStatus where selected == true"
+			if let limit {
+				sql = "\(sql) limit \(limit)"
+			}
+			return sql
+		}()
+
+		guard let resultSet = database.executeQuery(selectSQL, withArgumentsIn: nil) else {
+			return nil
+		}
+		let statuses = resultSet.mapToSet(self.statusWithRow)
+		return statuses
+	}
+
+	func selectPendingCount(database: FMDatabase) -> Int? {
+
+		let sql = "select count(*) from syncStatus"
+		guard let resultSet = database.executeQuery(sql, withArgumentsIn: nil) else {
+			return nil
+		}
+
+		let count = resultSet.intWithCountResult()
+		return count
+	}
+
+	func selectPendingReadStatusArticleIDs(database: FMDatabase) -> Set<String>? {
+
+		selectPendingArticleIDs(.read, database: database)
+	}
+
+	func selectPendingStarredStatusArticleIDs(database: FMDatabase) -> Set<String>? {
+
+		selectPendingArticleIDs(.starred, database: database)
+	}
+
+	func resetAllSelectedForProcessing(database: FMDatabase) {
+
+		let updateSQL = "update syncStatus set selected = false"
+		database.executeUpdateInTransaction(updateSQL)
+	}
+
+	func resetSelectedForProcessing(_ articleIDs: Set<String>, database: FMDatabase) {
+
+		guard !articleIDs.isEmpty else {
+			return
+		}
+
+		let parameters = articleIDs.map { $0 as AnyObject }
+		let placeholders = NSString.rs_SQLValueList(withPlaceholders: UInt(articleIDs.count))!
+		let updateSQL = "update syncStatus set selected = false where articleID in \(placeholders)"
+
+		database.executeUpdateInTransaction(updateSQL, withArgumentsIn: parameters)
+	}
+
+	func deleteSelectedForProcessing(_ articleIDs: Set<String>, database: FMDatabase) {
+
+		guard !articleIDs.isEmpty else {
+			return
+		}
+
+		let parameters = articleIDs.map { $0 as AnyObject }
+		let placeholders = NSString.rs_SQLValueList(withPlaceholders: UInt(articleIDs.count))!
+		let deleteSQL = "delete from syncStatus where selected = true and articleID in \(placeholders)"
+
+		database.executeUpdateInTransaction(deleteSQL, withArgumentsIn: parameters)
+	}
+
+	func insertStatuses(_ statuses: Set<SyncStatus>, database: FMDatabase) {
+
+		database.beginTransaction()
+
+		let statusArray = statuses.map { $0.databaseDictionary() }
+		database.insertRows(statusArray, insertType: .orReplace, tableName: Self.name)
+
+		database.commit()
+	}
+}
+
+private extension SyncStatusTable {
+
+	func statusWithRow(_ row: FMResultSet) -> SyncStatus? {
+
+		guard let articleID = row.string(forColumn: DatabaseKey.articleID),
+			let rawKey = row.string(forColumn: DatabaseKey.key),
+			let key = SyncStatus.Key(rawValue: rawKey) else {
+				return nil
+		}
+		
+		let flag = row.bool(forColumn: DatabaseKey.flag)
+		let selected = row.bool(forColumn: DatabaseKey.selected)
+		
+		return SyncStatus(articleID: articleID, key: key, flag: flag, selected: selected)
+	}
+
+	func selectPendingArticleIDs(_ statusKey: ArticleStatus.Key, database: FMDatabase) -> Set<String>? {
+
+		let sql = "select articleID from syncStatus where selected == false and key = \"\(statusKey.rawValue)\";"
+		guard let resultSet = database.executeQuery(sql, withArgumentsIn: nil) else {
+			return nil
+		}
+
+		let articleIDs = resultSet.mapToSet{ $0.string(forColumnIndex: 0) }
+		return articleIDs
+	}
+}