session-ios/SessionMessagingKit/Database/Migrations/_007_HomeQueryOptimisationIndexes.swift

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

import Foundation
import GRDB
import SessionUtilitiesKit

/// This migration adds an index to the interaction table in order to improve the performance of retrieving the number of unread interactions
enum _007_HomeQueryOptimisationIndexes: Migration {
    static let target: TargetMigrations.Identifier = .messagingKit
    static let identifier: String = "HomeQueryOptimisationIndexes" // stringlint:disable
    static let needsConfigSync: Bool = false
    static let minExpectedRunDuration: TimeInterval = 0.01
    static let fetchedTables: [(TableRecord & FetchableRecord).Type] = []
    static let createdOrAlteredTables: [(TableRecord & FetchableRecord).Type] = []
    static let droppedTables: [(TableRecord & FetchableRecord).Type] = []
    
    static func migrate(_ db: Database, using dependencies: Dependencies) throws {
        try db.create(
            index: "interaction_on_wasRead_and_hasMention_and_threadId", // stringlint:disable
            on: Interaction.databaseTableName,
            columns: [
                Interaction.Columns.wasRead.name,
                Interaction.Columns.hasMention.name,
                Interaction.Columns.threadId.name
            ]
        )
        
        try db.create(
            index: "interaction_on_threadId_and_timestampMs_and_variant", // stringlint:disable
            on: Interaction.databaseTableName,
            columns: [
                Interaction.Columns.threadId.name,
                Interaction.Columns.timestampMs.name,
                Interaction.Columns.variant.name
            ]
        )
        
        Storage.update(progress: 1, for: self, in: target) // In case this is the last migration
    }
}