session-ios/SessionSnodeKit/Database/Migrations/_004_FlagMessageHashAsDeletedOrInvalid.swift

// Copyright © 2022 Rangeproof Pty Ltd. All rights reserved.

import Foundation
import GRDB
import YapDatabase
import SessionUtilitiesKit

enum _004_FlagMessageHashAsDeletedOrInvalid: Migration {
    static let target: TargetMigrations.Identifier = .snodeKit
    static let identifier: String = "FlagMessageHashAsDeletedOrInvalid" // stringlint:disable
    static let needsConfigSync: Bool = false
    static let fetchedTables: [(TableRecord & FetchableRecord).Type] = []
    static let createdOrAlteredTables: [(TableRecord & FetchableRecord).Type] = [SnodeReceivedMessageInfo.self]
    
    /// This migration adds a flat to the `SnodeReceivedMessageInfo` so that when deleting interactions we can
    /// ignore their hashes when subsequently trying to fetch new messages (which results in the storage server returning
    /// messages from the beginning of time)
    static let minExpectedRunDuration: TimeInterval = 0.2
    
    static func migrate(_ db: Database) throws {
        try db.alter(table: SnodeReceivedMessageInfo.self) { t in
            t.add(.wasDeletedOrInvalid, .boolean)
                .indexed()                                 // Faster querying
        }
        
        Storage.update(progress: 1, for: self, in: target) // In case this is the last migration
    }
}