Expand onboarding and adaptive keyboard intelligence

Add resilient usage analytics, OOBE gateway flows, clipboard semantic ranking, purchase recovery, style learning, and managed current-information search.
2026-08-22 16:33:18 +08:00
parent ac374631ae
commit e5a83843db
162 changed files with 23574 additions and 1013 deletions
@@ -89,7 +89,6 @@ public enum AnalyticsModelError: Error, Sendable {
 }

 public struct AnalyticsEvent: Codable, Equatable, Sendable {
-    public let installationId: UUID
    public let clientEventId: UUID
    public let eventType: AnalyticsEventType
    public let occurredAt: Date
@@ -103,7 +102,6 @@ public struct AnalyticsEvent: Codable, Equatable, Sendable {
    public let durationBucket: AnalyticsDurationBucket?

    public init(
-        installationId: UUID,
        clientEventId: UUID,
        eventType: AnalyticsEventType,
        occurredAt: Date,
@@ -121,7 +119,6 @@ public struct AnalyticsEvent: Codable, Equatable, Sendable {
            throw AnalyticsModelError.invalidVersion
        }

-        self.installationId = installationId
        self.clientEventId = clientEventId
        self.eventType = eventType
        self.occurredAt = occurredAt
@@ -140,7 +137,6 @@ public struct AnalyticsEvent: Codable, Equatable, Sendable {
    }

    private enum CodingKeys: String, CodingKey, CaseIterable {
-        case installationId
        case clientEventId
        case eventType
        case occurredAt
@@ -160,7 +156,6 @@ public struct AnalyticsEvent: Codable, Equatable, Sendable {
            allowed: Set(CodingKeys.allCases.map(\.rawValue))
        )
        let container = try decoder.container(keyedBy: CodingKeys.self)
-        let installationId = try container.decode(UUID.self, forKey: .installationId)
        let clientEventId = try container.decode(UUID.self, forKey: .clientEventId)
        let eventType = try container.decode(AnalyticsEventType.self, forKey: .eventType)
        let occurredAtText = try container.decode(String.self, forKey: .occurredAt)
@@ -172,7 +167,6 @@ public struct AnalyticsEvent: Codable, Equatable, Sendable {
            )
        }
        try self.init(
-            installationId: installationId,
            clientEventId: clientEventId,
            eventType: eventType,
            occurredAt: occurredAt,
@@ -204,7 +198,6 @@ public struct AnalyticsEvent: Codable, Equatable, Sendable {
            throw AnalyticsModelError.invalidDimensions(eventType)
        }
        var container = encoder.container(keyedBy: CodingKeys.self)
-        try container.encode(installationId, forKey: .installationId)
        try container.encode(clientEventId, forKey: .clientEventId)
        try container.encode(eventType, forKey: .eventType)
        try container.encode(AnalyticsWireDate.string(from: occurredAt), forKey: .occurredAt)
@@ -237,13 +230,16 @@ public struct AnalyticsEvent: Codable, Equatable, Sendable {
 }

 public struct AnalyticsUploadRequest: Codable, Equatable, Sendable {
+    public let installationId: UUID
    public let events: [AnalyticsEvent]

-    public init(events: [AnalyticsEvent]) {
+    public init(installationId: UUID, events: [AnalyticsEvent]) {
+        self.installationId = installationId
        self.events = events
    }

    private enum CodingKeys: String, CodingKey, CaseIterable {
+        case installationId
        case events
    }

@@ -253,6 +249,7 @@ public struct AnalyticsUploadRequest: Codable, Equatable, Sendable {
            allowed: Set(CodingKeys.allCases.map(\.rawValue))
        )
        let container = try decoder.container(keyedBy: CodingKeys.self)
+        installationId = try container.decode(UUID.self, forKey: .installationId)
        events = try container.decode([AnalyticsEvent].self, forKey: .events)
    }
 }
@@ -335,6 +332,7 @@ private extension AnalyticsEventType {
        switch self {
        case .firstOpen, .inviteOpened:
            return [
+                .none,
                DimensionSet(
                    acquisitionChannel: true,
                    feature: false,
@@ -72,6 +72,7 @@ struct AnalyticsLeasedEvent: Sendable {

 struct AnalyticsLeasedBatch: Sendable {
    let leaseID: String
+    let installationID: UUID
    let events: [AnalyticsLeasedEvent]
    let body: Data
 }
@@ -141,7 +142,6 @@ public actor AnalyticsRepository {
                    return
                }
                let event = try AnalyticsEvent(
-                    installationId: installationID,
                    clientEventId: uuidGenerator.makeUUID(),
                    eventType: .firstOpen,
                    occurredAt: clock.now(),
@@ -150,7 +150,11 @@ public actor AnalyticsRepository {
                    osVersion: context.environment.osVersion,
                    acquisitionChannel: firstOpenAcquisitionChannel
                )
-                try insert(event, database: database)
+                try insert(
+                    event,
+                    installationID: installationID,
+                    database: database
+                )
                try setMetadata(
                    "1",
                    for: MetadataKey.firstOpenRecorded,
@@ -172,6 +176,21 @@ public actor AnalyticsRepository {
        }
    }

+    /// Returns the existing App Group installation UUID, creating it only while
+    /// analytics is enabled. Aggregate keyboard usage reuses this identity.
+    public func installationIdentifierIfEnabled() -> UUID? {
+        guard let database = openDatabaseIfNeeded() else { return nil }
+        do {
+            return try database.immediateTransaction {
+                _ = try ensureEnabled(database)
+                guard try isEnabled(database) else { return nil }
+                return try ensureInstallation(database)
+            }
+        } catch {
+            return nil
+        }
+    }
+
    /// Read-only diagnostics for tests and support tooling. Event payload content
    /// is deliberately excluded from this public snapshot.
    public func debugSnapshot() -> AnalyticsRepositoryDebugSnapshot {
@@ -355,7 +374,6 @@ public actor AnalyticsRepository {
                guard try isEnabled(database) else { return }
                let installationID = try ensureInstallation(database)
                let event = try AnalyticsEvent(
-                    installationId: installationID,
                    clientEventId: uuidGenerator.makeUUID(),
                    eventType: eventType,
                    occurredAt: clock.now(),
@@ -368,7 +386,11 @@ public actor AnalyticsRepository {
                    failureCategory: dimensions.failureCategory,
                    durationBucket: dimensions.durationBucket
                )
-                try insert(event, database: database)
+                try insert(
+                    event,
+                    installationID: installationID,
+                    database: database
+                )
                try enforceStoragePolicy(database)
            }
        }
@@ -402,7 +424,6 @@ public actor AnalyticsRepository {

                let installationID = try ensureInstallation(database)
                let event = try AnalyticsEvent(
-                    installationId: installationID,
                    clientEventId: uuidGenerator.makeUUID(),
                    eventType: .sessionStarted,
                    occurredAt: now,
@@ -410,7 +431,11 @@ public actor AnalyticsRepository {
                    appVersion: context.environment.appVersion,
                    osVersion: context.environment.osVersion
                )
-                try insert(event, database: database)
+                try insert(
+                    event,
+                    installationID: installationID,
+                    database: database
+                )
                try setMetadata(
                    String(now.timeIntervalSince1970),
                    for: key,
@@ -441,19 +466,42 @@ public actor AnalyticsRepository {
                try releaseExpiredEventLeases(now: now, database: database)
                try deleteExpiredEvents(now: now, database: database)

+                guard let installationText = try database.query(
+                    """
+                    SELECT installation_id
+                    FROM pending_events
+                    WHERE next_attempt_at <= ? AND lease_id IS NULL
+                    ORDER BY priority DESC, created_at ASC
+                    LIMIT 1
+                    """,
+                    bindings: [.double(now)]
+                ).first?.text(at: 0),
+                let installationID = UUID(uuidString: installationText) else {
+                    try clearUploadLease(database)
+                    return nil
+                }
+
                let candidates = try database.query(
                    """
                    SELECT id, payload, attempt_count
                    FROM pending_events
-                    WHERE next_attempt_at <= ? AND lease_id IS NULL
+                    WHERE installation_id = ?
+                      AND next_attempt_at <= ?
+                      AND lease_id IS NULL
                    ORDER BY priority DESC, created_at ASC
                    LIMIT ?
                    """,
-                    bindings: [.double(now), .int64(Int64(upload.maximumBatchCount))]
+                    bindings: [
+                        .text(installationText),
+                        .double(now),
+                        .int64(Int64(upload.maximumBatchCount))
+                    ]
                )

                var selected: [AnalyticsLeasedEvent] = []
-                var bodySize = Self.emptyRequestBody.count
+                var bodySize = Self.emptyRequestBody(
+                    installationID: installationID
+                ).count
                for row in candidates {
                    guard let rowID = row.int64(at: 0),
                          let payload = row.data(at: 1),
@@ -504,8 +552,12 @@ public actor AnalyticsRepository {
                }
                return AnalyticsLeasedBatch(
                    leaseID: leaseID,
+                    installationID: installationID,
                    events: selected,
-                    body: Self.requestBody(for: selected)
+                    body: Self.requestBody(
+                        for: selected,
+                        installationID: installationID
+                    )
                )
            }
        } catch {
@@ -696,18 +748,20 @@ public actor AnalyticsRepository {

    private func insert(
        _ event: AnalyticsEvent,
+        installationID: UUID,
        database: SQLiteDatabase
    ) throws {
        let payload = try AnalyticsCanonicalJSON.encode(event)
        try database.execute(
            """
            INSERT OR IGNORE INTO pending_events (
-                client_event_id, event_type, occurred_at, surface, payload,
-                payload_size, priority, lease_id, lease_expires_at,
+                installation_id, client_event_id, event_type, occurred_at,
+                surface, payload, payload_size, priority, lease_id, lease_expires_at,
                attempt_count, next_attempt_at, created_at
-            ) VALUES (?, ?, ?, ?, ?, ?, ?, NULL, NULL, 0, 0, ?)
+            ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, NULL, NULL, 0, 0, ?)
            """,
            bindings: [
+                .text(installationID.uuidString.lowercased()),
                .text(event.clientEventId.uuidString.lowercased()),
                .text(event.eventType.rawValue),
                .double(event.occurredAt.timeIntervalSince1970),
@@ -887,11 +941,12 @@ public actor AnalyticsRepository {
            try database.execute(
                """
                INSERT INTO quarantined_events (
-                    client_event_id, event_type, occurred_at, surface, payload,
-                    payload_size, attempt_count, reason, quarantined_at
+                    installation_id, client_event_id, event_type, occurred_at,
+                    surface, payload, payload_size, attempt_count, reason,
+                    quarantined_at
                )
-                SELECT client_event_id, event_type, occurred_at, surface, payload,
-                       payload_size, attempt_count, ?, ?
+                SELECT installation_id, client_event_id, event_type, occurred_at,
+                       surface, payload, payload_size, attempt_count, ?, ?
                FROM pending_events
                WHERE id = ?\(leaseClause)
                """,
@@ -907,10 +962,18 @@ public actor AnalyticsRepository {
        try enforceStoragePolicy(database)
    }

-    private static let emptyRequestBody = Data(#"{"events":[]}"#.utf8)
+    private static func emptyRequestBody(installationID: UUID) -> Data {
+        requestBody(for: [], installationID: installationID)
+    }

-    private static func requestBody(for events: [AnalyticsLeasedEvent]) -> Data {
-        var body = Data(#"{"events":["#.utf8)
+    private static func requestBody(
+        for events: [AnalyticsLeasedEvent],
+        installationID: UUID
+    ) -> Data {
+        var body = Data(
+            #"{"installationId":"\#(installationID.uuidString.lowercased())","events":["#
+                .utf8
+        )
        for index in events.indices {
            if index > 0 {
                body.append(UInt8(ascii: ","))
@@ -967,7 +1030,7 @@ public actor AnalyticsRepository {

    private func migrate(_ database: SQLiteDatabase) throws {
        let version = try database.scalarInt64("PRAGMA user_version") ?? 0
-        guard version <= 1 else {
+        guard version <= 2 else {
            throw SQLiteStoreError(
                code: SQLITE_MISMATCH,
                category: .schema,
@@ -984,58 +1047,90 @@ public actor AnalyticsRepository {
                    ) WITHOUT ROWID
                    """
                )
+                try createCurrentQueueSchema(database)
+                try database.execute("PRAGMA user_version = 2")
+            }
+        } else if version == 1 {
+            try database.immediateTransaction {
+                // Another process may have completed the migration while this
+                // connection waited for BEGIN IMMEDIATE.
+                guard try database.scalarInt64("PRAGMA user_version") == 1 else {
+                    return
+                }
+                // v1 payloads contain installationId inside each event and are
+                // incompatible with the server's strict v2 envelope. Drop them
+                // without decoding so neither old content nor identifiers can
+                // escape through logs or a partially migrated retry.
+                try database.execute("DROP TABLE IF EXISTS pending_events")
+                try database.execute("DROP TABLE IF EXISTS quarantined_events")
+                try createCurrentQueueSchema(database)
                try database.execute(
-                    """
-                    CREATE TABLE IF NOT EXISTS pending_events (
-                        id INTEGER PRIMARY KEY AUTOINCREMENT,
-                        client_event_id TEXT UNIQUE NOT NULL,
-                        event_type TEXT NOT NULL,
-                        occurred_at REAL NOT NULL,
-                        surface TEXT NOT NULL,
-                        payload BLOB NOT NULL,
-                        payload_size INTEGER NOT NULL CHECK(payload_size >= 0),
-                        priority INTEGER NOT NULL,
-                        lease_id TEXT,
-                        lease_expires_at REAL,
-                        attempt_count INTEGER NOT NULL DEFAULT 0,
-                        next_attempt_at REAL NOT NULL DEFAULT 0,
-                        created_at REAL NOT NULL
-                    )
-                    """
+                    "DELETE FROM metadata WHERE key IN (?, ?, ?)",
+                    bindings: [
+                        .text(MetadataKey.firstOpenRecorded),
+                        .text(MetadataKey.uploadLeaseOwner),
+                        .text(MetadataKey.uploadLeaseExpiresAt)
+                    ]
                )
-                try database.execute(
-                    """
-                    CREATE INDEX IF NOT EXISTS pending_events_ready
-                    ON pending_events(next_attempt_at, lease_id, priority, created_at)
-                    """
-                )
-                try database.execute(
-                    """
-                    CREATE INDEX IF NOT EXISTS pending_events_expiry
-                    ON pending_events(occurred_at)
-                    """
-                )
-                try database.execute(
-                    """
-                    CREATE TABLE IF NOT EXISTS quarantined_events (
-                        id INTEGER PRIMARY KEY AUTOINCREMENT,
-                        client_event_id TEXT UNIQUE NOT NULL,
-                        event_type TEXT NOT NULL,
-                        occurred_at REAL NOT NULL,
-                        surface TEXT NOT NULL,
-                        payload BLOB NOT NULL,
-                        payload_size INTEGER NOT NULL,
-                        attempt_count INTEGER NOT NULL,
-                        reason TEXT NOT NULL,
-                        quarantined_at REAL NOT NULL
-                    )
-                    """
-                )
-                try database.execute("PRAGMA user_version = 1")
+                try database.execute("PRAGMA user_version = 2")
            }
        }
    }

+    private func createCurrentQueueSchema(_ database: SQLiteDatabase) throws {
+        try database.execute(
+            """
+            CREATE TABLE IF NOT EXISTS pending_events (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                installation_id TEXT NOT NULL,
+                client_event_id TEXT UNIQUE NOT NULL,
+                event_type TEXT NOT NULL,
+                occurred_at REAL NOT NULL,
+                surface TEXT NOT NULL,
+                payload BLOB NOT NULL,
+                payload_size INTEGER NOT NULL CHECK(payload_size >= 0),
+                priority INTEGER NOT NULL,
+                lease_id TEXT,
+                lease_expires_at REAL,
+                attempt_count INTEGER NOT NULL DEFAULT 0,
+                next_attempt_at REAL NOT NULL DEFAULT 0,
+                created_at REAL NOT NULL
+            )
+            """
+        )
+        try database.execute(
+            """
+            CREATE INDEX IF NOT EXISTS pending_events_ready
+            ON pending_events(
+                installation_id, next_attempt_at, lease_id, priority, created_at
+            )
+            """
+        )
+        try database.execute(
+            """
+            CREATE INDEX IF NOT EXISTS pending_events_expiry
+            ON pending_events(occurred_at)
+            """
+        )
+        try database.execute(
+            """
+            CREATE TABLE IF NOT EXISTS quarantined_events (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                installation_id TEXT NOT NULL,
+                client_event_id TEXT UNIQUE NOT NULL,
+                event_type TEXT NOT NULL,
+                occurred_at REAL NOT NULL,
+                surface TEXT NOT NULL,
+                payload BLOB NOT NULL,
+                payload_size INTEGER NOT NULL,
+                attempt_count INTEGER NOT NULL,
+                reason TEXT NOT NULL,
+                quarantined_at REAL NOT NULL
+            )
+            """
+        )
+    }
+
    private func applyFileProtection(to databaseURL: URL) {
        #if os(iOS)
        for url in [
@@ -1161,7 +1256,7 @@ private struct SQLiteStoreError: Error, Sendable {
    let operation: String
 }

-private enum SQLiteBinding {
+enum SQLiteBinding {
    case null
    case int64(Int64)
    case double(Double)
@@ -1169,7 +1264,7 @@ private enum SQLiteBinding {
    case blob(Data)
 }

-private struct SQLiteRow {
+struct SQLiteRow {
    private let values: [SQLiteValue]

    init(statement: OpaquePointer) {
@@ -1243,7 +1338,7 @@ private enum SQLiteValue {
    case blob(Data)
 }

-private final class SQLiteDatabase {
+final class SQLiteDatabase {
    private static let transient = unsafeBitCast(
        -1,
        to: sqlite3_destructor_type.self
@@ -77,7 +77,7 @@ public actor AnalyticsUploadCoordinator {
    /// Performs a bounded drain. The default keeps extension execution time and
    /// memory predictable while allowing a host app to request more batches.
    public func uploadAvailableEvents(maximumBatches: Int = 1) async {
-        guard !uploadInProgress else { return }
+        guard !uploadInProgress, !Task.isCancelled else { return }
        uploadInProgress = true
        defer { uploadInProgress = false }

@@ -95,18 +95,35 @@ public actor AnalyticsUploadCoordinator {
        let ownerID = uuidGenerator.makeUUID().uuidString.lowercased()
        let batchLimit = max(1, maximumBatches)
        for _ in 0..<batchLimit {
+            guard !Task.isCancelled else { return }
            guard let batch = await repository.leaseBatch(
                ownerID: ownerID,
                configuration: configuration
            ) else {
                return
            }
+            guard !Task.isCancelled else {
+                await releaseForCancellation(
+                    events: batch.events,
+                    leaseID: batch.leaseID,
+                    ownerID: ownerID
+                )
+                return
+            }

            var authorization = AuthorizationState()
            if let bearerProvider {
                do {
                    authorization.token = try await bearerProvider.bearerToken()
                } catch {
+                    if Task.isCancelled {
+                        await releaseForCancellation(
+                            events: batch.events,
+                            leaseID: batch.leaseID,
+                            ownerID: ownerID
+                        )
+                        return
+                    }
                    await scheduleRetry(
                        events: batch.events,
                        leaseID: batch.leaseID,
@@ -120,21 +137,28 @@ public actor AnalyticsUploadCoordinator {

            await process(
                events: batch.events,
+                installationID: batch.installationID,
                leaseID: batch.leaseID,
                ownerID: ownerID,
                authorization: &authorization
            )
            await repository.releaseGlobalLease(ownerID: ownerID)
+            guard !Task.isCancelled else { return }
        }
    }

    private func process(
        events: [AnalyticsLeasedEvent],
+        installationID: UUID,
        leaseID: String,
        ownerID: String,
        authorization: inout AuthorizationState
    ) async {
        guard !events.isEmpty else { return }
+        guard !Task.isCancelled else {
+            await repository.releaseEvents(events, leaseID: leaseID)
+            return
+        }
        guard await renewLease(
            events: events,
            leaseID: leaseID,
@@ -142,11 +166,23 @@ public actor AnalyticsUploadCoordinator {
        ) else {
            return
        }
+        guard !Task.isCancelled else {
+            await repository.releaseEvents(events, leaseID: leaseID)
+            return
+        }

        let response: AnalyticsHTTPResponse
        do {
-            response = try await send(events: events, token: authorization.token)
+            response = try await send(
+                events: events,
+                installationID: installationID,
+                token: authorization.token
+            )
        } catch {
+            if Task.isCancelled {
+                await repository.releaseEvents(events, leaseID: leaseID)
+                return
+            }
            await scheduleRetry(
                events: events,
                leaseID: leaseID,
@@ -172,15 +208,24 @@ public actor AnalyticsUploadCoordinator {
                ) else {
                    return
                }
-                let refreshed = try await send(events: events, token: authorization.token)
+                let refreshed = try await send(
+                    events: events,
+                    installationID: installationID,
+                    token: authorization.token
+                )
                await processResponse(
                    refreshed,
                    events: events,
+                    installationID: installationID,
                    leaseID: leaseID,
                    ownerID: ownerID,
                    authorization: &authorization
                )
            } catch {
+                if Task.isCancelled {
+                    await repository.releaseEvents(events, leaseID: leaseID)
+                    return
+                }
                await scheduleRetry(
                    events: events,
                    leaseID: leaseID,
@@ -195,6 +240,7 @@ public actor AnalyticsUploadCoordinator {
        await processResponse(
            response,
            events: events,
+            installationID: installationID,
            leaseID: leaseID,
            ownerID: ownerID,
            authorization: &authorization
@@ -204,10 +250,15 @@ public actor AnalyticsUploadCoordinator {
    private func processResponse(
        _ response: AnalyticsHTTPResponse,
        events: [AnalyticsLeasedEvent],
+        installationID: UUID,
        leaseID: String,
        ownerID: String,
        authorization: inout AuthorizationState
    ) async {
+        guard !Task.isCancelled else {
+            await repository.releaseEvents(events, leaseID: leaseID)
+            return
+        }
        switch response.statusCode {
        case 200:
            let decoded: AnalyticsUploadResponse
@@ -270,12 +321,14 @@ public actor AnalyticsUploadCoordinator {
            let midpoint = events.count / 2
            await process(
                events: Array(events[..<midpoint]),
+                installationID: installationID,
                leaseID: leaseID,
                ownerID: ownerID,
                authorization: &authorization
            )
            await process(
                events: Array(events[midpoint...]),
+                installationID: installationID,
                leaseID: leaseID,
                ownerID: ownerID,
                authorization: &authorization
@@ -340,8 +393,18 @@ public actor AnalyticsUploadCoordinator {
        }
    }

+    private func releaseForCancellation(
+        events: [AnalyticsLeasedEvent],
+        leaseID: String,
+        ownerID: String
+    ) async {
+        await repository.releaseEvents(events, leaseID: leaseID)
+        await repository.releaseGlobalLease(ownerID: ownerID)
+    }
+
    private func send(
        events: [AnalyticsLeasedEvent],
+        installationID: UUID,
        token: String?
    ) async throws -> AnalyticsHTTPResponse {
        var headers = [
@@ -355,7 +418,10 @@ public actor AnalyticsUploadCoordinator {
            AnalyticsHTTPRequest(
                url: configuration.endpoint,
                headers: headers,
-                body: Self.requestBody(for: events)
+                body: Self.requestBody(
+                    for: events,
+                    installationID: installationID
+                )
            )
        )
    }
@@ -445,8 +511,14 @@ public actor AnalyticsUploadCoordinator {
        events.map(\.attemptCount).max() ?? 0
    }

-    private static func requestBody(for events: [AnalyticsLeasedEvent]) -> Data {
-        var body = Data(#"{"events":["#.utf8)
+    private static func requestBody(
+        for events: [AnalyticsLeasedEvent],
+        installationID: UUID
+    ) -> Data {
+        var body = Data(
+            #"{"installationId":"\#(installationID.uuidString.lowercased())","events":["#
+                .utf8
+        )
        for index in events.indices {
            if index > 0 {
                body.append(UInt8(ascii: ","))
@@ -0,0 +1,129 @@
+// KeyboardUsageClient.swift
+// OSGKeyboard · Shared
+//
+// Fire-and-forget numeric recording facade. Calls are serialized per process so
+// a UTC rollover cannot finalize a day ahead of an earlier queued insertion.
+
+import Foundation
+
+public protocol KeyboardUsageRecording: Sendable {
+    func recordManualKeyboardCounts(
+        _ counts: KeyboardUsageCharacterCounts,
+        sessionID: UUID
+    )
+}
+
+public struct NoopKeyboardUsageRecorder: KeyboardUsageRecording {
+    public init() {}
+
+    public func recordManualKeyboardCounts(
+        _ counts: KeyboardUsageCharacterCounts,
+        sessionID: UUID
+    ) {}
+}
+
+public final class LiveKeyboardUsageRecorder:
+    KeyboardUsageRecording,
+    @unchecked Sendable {
+    private let analyticsRepository: AnalyticsRepository
+    private let repository: KeyboardUsageRepository
+    private let environment: AnalyticsEnvironment
+    private let clock: any AnalyticsWallClock
+    private let trigger: any AnalyticsUploadTriggering
+    private let lock = NSLock()
+    private var tailTask: Task<Void, Never>?
+
+    public init(
+        analyticsRepository: AnalyticsRepository,
+        repository: KeyboardUsageRepository,
+        environment: AnalyticsEnvironment,
+        clock: any AnalyticsWallClock = SystemAnalyticsWallClock(),
+        trigger: any AnalyticsUploadTriggering = NoopAnalyticsUploadTrigger()
+    ) {
+        self.analyticsRepository = analyticsRepository
+        self.repository = repository
+        self.environment = environment
+        self.clock = clock
+        self.trigger = trigger
+    }
+
+    public func recordManualKeyboardCounts(
+        _ counts: KeyboardUsageCharacterCounts,
+        sessionID: UUID
+    ) {
+        guard !counts.isEmpty else { return }
+        let occurredAt = clock.now()
+        let analyticsRepository = analyticsRepository
+        let repository = repository
+        let environment = environment
+        let trigger = trigger
+
+        lock.withLock {
+            let previous = tailTask
+            tailTask = Task {
+                await previous?.value
+                guard let installationID =
+                        await analyticsRepository.installationIdentifierIfEnabled() else {
+                    return
+                }
+                await repository.record(
+                    counts: counts,
+                    sessionID: sessionID,
+                    installationID: installationID,
+                    occurredAt: occurredAt,
+                    environment: environment
+                )
+                await trigger.requestUpload()
+            }
+        }
+    }
+
+    func waitForPendingRecords() async {
+        let task = lock.withLock { tailTask }
+        await task?.value
+    }
+}
+
+public struct KeyboardUsageRuntime: Sendable {
+    public let repository: KeyboardUsageRepository
+    public let recorder: any KeyboardUsageRecording
+    public let uploadCoordinator: KeyboardUsageUploadCoordinator
+
+    public init(
+        environment: AnalyticsEnvironment,
+        analyticsRepository: AnalyticsRepository,
+        repositoryConfiguration: KeyboardUsageRepositoryConfiguration = .appGroupDefault(),
+        uploadConfiguration: KeyboardUsageUploadConfiguration,
+        network: any AnalyticsNetworking = URLSessionAnalyticsNetwork(),
+        bearerProvider: (any AnalyticsBearerProviding)? = nil,
+        wallClock: any AnalyticsWallClock = SystemAnalyticsWallClock(),
+        uuidGenerator: any AnalyticsUUIDGenerating = SystemAnalyticsUUIDGenerator(),
+        random: any AnalyticsRandomGenerating = SystemAnalyticsRandomGenerator(),
+        trigger: any AnalyticsUploadTriggering = NoopAnalyticsUploadTrigger(),
+        logger: any AnalyticsLogging = NoopAnalyticsLogger()
+    ) {
+        let repository = KeyboardUsageRepository(
+            configuration: repositoryConfiguration,
+            clock: wallClock,
+            uuidGenerator: uuidGenerator
+        )
+        self.repository = repository
+        recorder = LiveKeyboardUsageRecorder(
+            analyticsRepository: analyticsRepository,
+            repository: repository,
+            environment: environment,
+            clock: wallClock,
+            trigger: trigger
+        )
+        uploadCoordinator = KeyboardUsageUploadCoordinator(
+            repository: repository,
+            configuration: uploadConfiguration,
+            network: network,
+            bearerProvider: bearerProvider,
+            clock: wallClock,
+            uuidGenerator: uuidGenerator,
+            random: random,
+            logger: logger
+        )
+    }
+}
@@ -0,0 +1,424 @@
+// KeyboardUsageModels.swift
+// OSGKeyboard · Shared
+//
+// Fixed-schema keyboard usage summaries. Raw text never crosses this model
+// boundary: callers provide only grapheme counts and random session IDs.
+
+import Foundation
+
+public enum KeyboardTextInsertionSource: String, CaseIterable, Sendable {
+    case manualKeyboard = "MANUAL_KEYBOARD"
+    case voiceTranscription = "VOICE_TRANSCRIPTION"
+    case aiGenerated = "AI_GENERATED"
+    case pasteboard = "PASTEBOARD"
+    case editGenerated = "EDIT_GENERATED"
+    case redo = "REDO"
+    case assistantAction = "ASSISTANT_ACTION"
+    case debugDemo = "DEBUG_DEMO"
+
+    public var contributesToKeyboardUsage: Bool {
+        self == .manualKeyboard
+    }
+}
+
+public struct KeyboardUsageCharacterCounts: Equatable, Sendable {
+    public static let maximumPerCategory = 1_000_000
+
+    public let chinese: Int
+    public let english: Int
+    public let other: Int
+
+    public init(chinese: Int = 0, english: Int = 0, other: Int = 0) {
+        self.chinese = Self.clamped(chinese)
+        self.english = Self.clamped(english)
+        self.other = Self.clamped(other)
+    }
+
+    public var total: Int {
+        chinese + english + other
+    }
+
+    public var isEmpty: Bool {
+        total == 0
+    }
+
+    private static func clamped(_ value: Int) -> Int {
+        min(maximumPerCategory, max(0, value))
+    }
+}
+
+public enum KeyboardUsageCharacterClassifier {
+    public static func classify(_ text: String) -> KeyboardUsageCharacterCounts {
+        var chinese = 0
+        var english = 0
+        var other = 0
+
+        for character in text {
+            switch classification(of: character) {
+            case .chinese:
+                chinese = saturatingIncrement(chinese)
+            case .english:
+                english = saturatingIncrement(english)
+            case .other:
+                other = saturatingIncrement(other)
+            }
+        }
+        return KeyboardUsageCharacterCounts(
+            chinese: chinese,
+            english: english,
+            other: other
+        )
+    }
+
+    private enum Classification {
+        case chinese
+        case english
+        case other
+    }
+
+    private static func classification(of character: Character) -> Classification {
+        // ICU Script properties cover CJK extensions and future Unicode updates;
+        // checking the whole grapheme keeps combining sequences at one count.
+        if character.unicodeScalars.contains(where: {
+            matchesScript($0, regularExpression: hanScriptExpression)
+        }) {
+            return .chinese
+        }
+        if character.unicodeScalars.contains(where: {
+            isLetter($0) && matchesScript($0, regularExpression: latinScriptExpression)
+        }) {
+            return .english
+        }
+        return .other
+    }
+
+    private static func matchesScript(
+        _ scalar: Unicode.Scalar,
+        regularExpression: NSRegularExpression
+    ) -> Bool {
+        let text = String(scalar)
+        let range = NSRange(text.startIndex..<text.endIndex, in: text)
+        return regularExpression.firstMatch(
+            in: text,
+            options: [],
+            range: range
+        ) != nil
+    }
+
+    private static func isLetter(_ scalar: Unicode.Scalar) -> Bool {
+        switch scalar.properties.generalCategory {
+        case .uppercaseLetter,
+             .lowercaseLetter,
+             .titlecaseLetter,
+             .modifierLetter,
+             .otherLetter:
+            return true
+        default:
+            return false
+        }
+    }
+
+    private static func saturatingIncrement(_ value: Int) -> Int {
+        min(KeyboardUsageCharacterCounts.maximumPerCategory, value + 1)
+    }
+
+    private static let hanScriptExpression = try! NSRegularExpression(
+        pattern: #"^\p{sc=Han}$"#
+    )
+    private static let latinScriptExpression = try! NSRegularExpression(
+        pattern: #"^\p{sc=Latin}$"#
+    )
+}
+
+public enum KeyboardUsageSessionClassification: Int, CaseIterable, Sendable {
+    case chineseOnly = 0
+    case englishOnly = 1
+    case mixedLanguage = 2
+    case otherOnly = 3
+
+    init(counts: KeyboardUsageCharacterCounts) {
+        switch (counts.chinese > 0, counts.english > 0) {
+        case (true, true):
+            self = .mixedLanguage
+        case (true, false):
+            self = .chineseOnly
+        case (false, true):
+            self = .englishOnly
+        case (false, false):
+            self = .otherOnly
+        }
+    }
+
+    func merging(_ counts: KeyboardUsageCharacterCounts) -> Self {
+        let hasChinese = self == .chineseOnly
+            || self == .mixedLanguage
+            || counts.chinese > 0
+        let hasEnglish = self == .englishOnly
+            || self == .mixedLanguage
+            || counts.english > 0
+        switch (hasChinese, hasEnglish) {
+        case (true, true):
+            return .mixedLanguage
+        case (true, false):
+            return .chineseOnly
+        case (false, true):
+            return .englishOnly
+        case (false, false):
+            return .otherOnly
+        }
+    }
+}
+
+public enum KeyboardUsageModelError: Error, Sendable {
+    case invalidDate
+    case invalidCount
+    case invalidSessionPartition
+    case invalidVersion
+    case invalidResponseCounts
+    case unknownField(String)
+}
+
+public struct KeyboardUsageSummary: Codable, Equatable, Sendable {
+    public let clientSummaryId: UUID
+    public let summaryDate: String
+    public let chineseCharacterCount: Int
+    public let englishCharacterCount: Int
+    public let otherCharacterCount: Int
+    public let inputSessionCount: Int
+    public let chineseOnlySessionCount: Int
+    public let englishOnlySessionCount: Int
+    public let mixedLanguageSessionCount: Int
+    public let otherOnlySessionCount: Int
+    public let appVersion: String
+    public let osVersion: String
+
+    public init(
+        clientSummaryId: UUID,
+        summaryDate: String,
+        chineseCharacterCount: Int,
+        englishCharacterCount: Int,
+        otherCharacterCount: Int,
+        inputSessionCount: Int,
+        chineseOnlySessionCount: Int,
+        englishOnlySessionCount: Int,
+        mixedLanguageSessionCount: Int,
+        otherOnlySessionCount: Int,
+        appVersion: String,
+        osVersion: String
+    ) throws {
+        let characterCounts = [
+            chineseCharacterCount,
+            englishCharacterCount,
+            otherCharacterCount
+        ]
+        let sessionCounts = [
+            inputSessionCount,
+            chineseOnlySessionCount,
+            englishOnlySessionCount,
+            mixedLanguageSessionCount,
+            otherOnlySessionCount
+        ]
+        guard KeyboardUsageUTCDate.date(from: summaryDate) != nil else {
+            throw KeyboardUsageModelError.invalidDate
+        }
+        guard characterCounts.allSatisfy({
+            (0...KeyboardUsageCharacterCounts.maximumPerCategory).contains($0)
+        }),
+        sessionCounts.allSatisfy({ (0...100_000).contains($0) }) else {
+            throw KeyboardUsageModelError.invalidCount
+        }
+        guard chineseOnlySessionCount
+                + englishOnlySessionCount
+                + mixedLanguageSessionCount
+                + otherOnlySessionCount == inputSessionCount,
+              characterCounts.reduce(0, +) >= inputSessionCount else {
+            throw KeyboardUsageModelError.invalidSessionPartition
+        }
+        guard AnalyticsEnvironment.isSafeVersion(appVersion),
+              AnalyticsEnvironment.isSafeVersion(osVersion) else {
+            throw KeyboardUsageModelError.invalidVersion
+        }
+
+        self.clientSummaryId = clientSummaryId
+        self.summaryDate = summaryDate
+        self.chineseCharacterCount = chineseCharacterCount
+        self.englishCharacterCount = englishCharacterCount
+        self.otherCharacterCount = otherCharacterCount
+        self.inputSessionCount = inputSessionCount
+        self.chineseOnlySessionCount = chineseOnlySessionCount
+        self.englishOnlySessionCount = englishOnlySessionCount
+        self.mixedLanguageSessionCount = mixedLanguageSessionCount
+        self.otherOnlySessionCount = otherOnlySessionCount
+        self.appVersion = appVersion
+        self.osVersion = osVersion
+    }
+
+    private enum CodingKeys: String, CodingKey, CaseIterable {
+        case clientSummaryId
+        case summaryDate
+        case chineseCharacterCount
+        case englishCharacterCount
+        case otherCharacterCount
+        case inputSessionCount
+        case chineseOnlySessionCount
+        case englishOnlySessionCount
+        case mixedLanguageSessionCount
+        case otherOnlySessionCount
+        case appVersion
+        case osVersion
+    }
+
+    public init(from decoder: Decoder) throws {
+        try KeyboardUsageCodableAllowlist.rejectUnknownKeys(
+            in: decoder,
+            allowed: Set(CodingKeys.allCases.map(\.rawValue))
+        )
+        let container = try decoder.container(keyedBy: CodingKeys.self)
+        try self.init(
+            clientSummaryId: container.decode(UUID.self, forKey: .clientSummaryId),
+            summaryDate: container.decode(String.self, forKey: .summaryDate),
+            chineseCharacterCount: container.decode(Int.self, forKey: .chineseCharacterCount),
+            englishCharacterCount: container.decode(Int.self, forKey: .englishCharacterCount),
+            otherCharacterCount: container.decode(Int.self, forKey: .otherCharacterCount),
+            inputSessionCount: container.decode(Int.self, forKey: .inputSessionCount),
+            chineseOnlySessionCount: container.decode(
+                Int.self,
+                forKey: .chineseOnlySessionCount
+            ),
+            englishOnlySessionCount: container.decode(
+                Int.self,
+                forKey: .englishOnlySessionCount
+            ),
+            mixedLanguageSessionCount: container.decode(
+                Int.self,
+                forKey: .mixedLanguageSessionCount
+            ),
+            otherOnlySessionCount: container.decode(
+                Int.self,
+                forKey: .otherOnlySessionCount
+            ),
+            appVersion: container.decode(String.self, forKey: .appVersion),
+            osVersion: container.decode(String.self, forKey: .osVersion)
+        )
+    }
+}
+
+public struct KeyboardUsageUploadRequest: Codable, Equatable, Sendable {
+    public let installationId: UUID
+    public let summaries: [KeyboardUsageSummary]
+
+    public init(installationId: UUID, summaries: [KeyboardUsageSummary]) {
+        self.installationId = installationId
+        self.summaries = summaries
+    }
+
+    private enum CodingKeys: String, CodingKey, CaseIterable {
+        case installationId
+        case summaries
+    }
+
+    public init(from decoder: Decoder) throws {
+        try KeyboardUsageCodableAllowlist.rejectUnknownKeys(
+            in: decoder,
+            allowed: Set(CodingKeys.allCases.map(\.rawValue))
+        )
+        let container = try decoder.container(keyedBy: CodingKeys.self)
+        installationId = try container.decode(UUID.self, forKey: .installationId)
+        summaries = try container.decode([KeyboardUsageSummary].self, forKey: .summaries)
+    }
+}
+
+public struct KeyboardUsageUploadResponse: Codable, Equatable, Sendable {
+    public let accepted: Int
+    public let replayed: Int
+
+    public init(accepted: Int, replayed: Int) throws {
+        guard accepted >= 0, replayed >= 0 else {
+            throw KeyboardUsageModelError.invalidResponseCounts
+        }
+        self.accepted = accepted
+        self.replayed = replayed
+    }
+
+    private enum CodingKeys: String, CodingKey, CaseIterable {
+        case accepted
+        case replayed
+    }
+
+    public init(from decoder: Decoder) throws {
+        try KeyboardUsageCodableAllowlist.rejectUnknownKeys(
+            in: decoder,
+            allowed: Set(CodingKeys.allCases.map(\.rawValue))
+        )
+        let container = try decoder.container(keyedBy: CodingKeys.self)
+        try self.init(
+            accepted: container.decode(Int.self, forKey: .accepted),
+            replayed: container.decode(Int.self, forKey: .replayed)
+        )
+    }
+}
+
+enum KeyboardUsageUTCDate {
+    static func string(from date: Date) -> String {
+        formatter.string(from: date)
+    }
+
+    static func date(from value: String) -> Date? {
+        guard value.utf8.count == 10 else { return nil }
+        return formatter.date(from: value)
+    }
+
+    static func oldestAcceptedDate(relativeTo today: String) -> String? {
+        guard let todayDate = date(from: today),
+              let oldest = calendar.date(byAdding: .day, value: -35, to: todayDate) else {
+            return nil
+        }
+        return string(from: oldest)
+    }
+
+    private static var formatter: DateFormatter {
+        let formatter = DateFormatter()
+        formatter.calendar = calendar
+        formatter.locale = Locale(identifier: "en_US_POSIX")
+        formatter.timeZone = TimeZone(secondsFromGMT: 0)
+        formatter.dateFormat = "yyyy-MM-dd"
+        formatter.isLenient = false
+        return formatter
+    }
+
+    private static var calendar: Calendar {
+        var calendar = Calendar(identifier: .gregorian)
+        calendar.locale = Locale(identifier: "en_US_POSIX")
+        calendar.timeZone = TimeZone(secondsFromGMT: 0)!
+        return calendar
+    }
+}
+
+private enum KeyboardUsageCodableAllowlist {
+    static func rejectUnknownKeys(
+        in decoder: Decoder,
+        allowed: Set<String>
+    ) throws {
+        let container = try decoder.container(keyedBy: KeyboardUsageAnyCodingKey.self)
+        if let unknown = container.allKeys.first(where: {
+            !allowed.contains($0.stringValue)
+        }) {
+            throw KeyboardUsageModelError.unknownField(unknown.stringValue)
+        }
+    }
+}
+
+private struct KeyboardUsageAnyCodingKey: CodingKey {
+    let stringValue: String
+    let intValue: Int?
+
+    init?(stringValue: String) {
+        self.stringValue = stringValue
+        intValue = nil
+    }
+
+    init?(intValue: Int) {
+        stringValue = String(intValue)
+        self.intValue = intValue
+    }
+}
@@ -0,0 +1,547 @@
+// KeyboardUsageUploadCoordinator.swift
+// OSGKeyboard · Shared
+//
+// Uploads immutable daily summaries with the existing analytics transport,
+// optional account bearer, bounded retry and cross-process leases.
+
+import Foundation
+
+public struct KeyboardUsageUploadConfiguration: Sendable {
+    public let endpoint: URL
+    public let maximumBatchCount: Int
+    public let globalLeaseDuration: TimeInterval
+    public let summaryLeaseDuration: TimeInterval
+    public let maximumBackoff: TimeInterval
+
+    public init(
+        endpoint: URL,
+        maximumBatchCount: Int = 50,
+        globalLeaseDuration: TimeInterval = 2 * 60,
+        summaryLeaseDuration: TimeInterval = 5 * 60,
+        maximumBackoff: TimeInterval = 6 * 60 * 60
+    ) {
+        self.endpoint = endpoint
+        self.maximumBatchCount = min(50, max(1, maximumBatchCount))
+        self.globalLeaseDuration = max(60, globalLeaseDuration)
+        self.summaryLeaseDuration = max(60, summaryLeaseDuration)
+        self.maximumBackoff = min(6 * 60 * 60, max(60, maximumBackoff))
+    }
+}
+
+public actor KeyboardUsageUploadCoordinator {
+    private struct AuthorizationState {
+        var token: String?
+        var didRefresh = false
+    }
+
+    private let repository: KeyboardUsageRepository
+    private let configuration: KeyboardUsageUploadConfiguration
+    private let network: any AnalyticsNetworking
+    private let bearerProvider: (any AnalyticsBearerProviding)?
+    private let clock: any AnalyticsWallClock
+    private let uuidGenerator: any AnalyticsUUIDGenerating
+    private let random: any AnalyticsRandomGenerating
+    private let logger: any AnalyticsLogging
+    private var uploadInProgress = false
+
+    public init(
+        repository: KeyboardUsageRepository,
+        configuration: KeyboardUsageUploadConfiguration,
+        network: any AnalyticsNetworking = URLSessionAnalyticsNetwork(),
+        bearerProvider: (any AnalyticsBearerProviding)? = nil,
+        clock: any AnalyticsWallClock = SystemAnalyticsWallClock(),
+        uuidGenerator: any AnalyticsUUIDGenerating = SystemAnalyticsUUIDGenerator(),
+        random: any AnalyticsRandomGenerating = SystemAnalyticsRandomGenerator(),
+        logger: any AnalyticsLogging = NoopAnalyticsLogger()
+    ) {
+        self.repository = repository
+        self.configuration = configuration
+        self.network = network
+        self.bearerProvider = bearerProvider
+        self.clock = clock
+        self.uuidGenerator = uuidGenerator
+        self.random = random
+        self.logger = logger
+    }
+
+    public func uploadAvailableSummaries(maximumBatches: Int = 1) async {
+        guard !uploadInProgress, !Task.isCancelled else { return }
+        uploadInProgress = true
+        defer { uploadInProgress = false }
+
+        guard configuration.endpoint.scheme?.lowercased() == "https" else {
+            log(
+                outcome: .skipped,
+                count: 0,
+                category: .client
+            )
+            return
+        }
+
+        let ownerID = uuidGenerator.makeUUID().uuidString.lowercased()
+        for _ in 0..<max(1, maximumBatches) {
+            guard !Task.isCancelled else { return }
+            guard let batch = await repository.leaseBatch(
+                ownerID: ownerID,
+                configuration: configuration
+            ) else {
+                return
+            }
+            guard !Task.isCancelled else {
+                await releaseForCancellation(
+                    summaries: batch.summaries,
+                    leaseID: batch.leaseID,
+                    ownerID: ownerID
+                )
+                return
+            }
+            var authorization = AuthorizationState()
+            if let bearerProvider {
+                do {
+                    authorization.token = try await bearerProvider.bearerToken()
+                } catch {
+                    if Task.isCancelled {
+                        await releaseForCancellation(
+                            summaries: batch.summaries,
+                            leaseID: batch.leaseID,
+                            ownerID: ownerID
+                        )
+                        return
+                    }
+                    await scheduleRetry(
+                        batch.summaries,
+                        leaseID: batch.leaseID,
+                        response: nil,
+                        category: .authentication
+                    )
+                    await repository.releaseGlobalLease(ownerID: ownerID)
+                    return
+                }
+            }
+            await process(
+                batch.summaries,
+                installationID: batch.installationID,
+                leaseID: batch.leaseID,
+                ownerID: ownerID,
+                authorization: &authorization
+            )
+            await repository.releaseGlobalLease(ownerID: ownerID)
+            guard !Task.isCancelled else { return }
+        }
+    }
+
+    private func process(
+        _ summaries: [KeyboardUsageLeasedSummary],
+        installationID: UUID,
+        leaseID: String,
+        ownerID: String,
+        authorization: inout AuthorizationState
+    ) async {
+        guard !summaries.isEmpty else { return }
+        guard !Task.isCancelled else {
+            await repository.release(summaries: summaries, leaseID: leaseID)
+            return
+        }
+        guard await renewLease(
+            summaries: summaries,
+            leaseID: leaseID,
+            ownerID: ownerID
+        ) else {
+            return
+        }
+        guard !Task.isCancelled else {
+            await repository.release(summaries: summaries, leaseID: leaseID)
+            return
+        }
+
+        let response: AnalyticsHTTPResponse
+        do {
+            response = try await send(
+                summaries: summaries,
+                installationID: installationID,
+                token: authorization.token
+            )
+        } catch {
+            if Task.isCancelled {
+                await repository.release(summaries: summaries, leaseID: leaseID)
+                return
+            }
+            await scheduleRetry(
+                summaries,
+                leaseID: leaseID,
+                response: nil,
+                category: Self.networkCategory(for: error)
+            )
+            return
+        }
+
+        if response.statusCode == 401,
+           !authorization.didRefresh,
+           let bearerProvider {
+            authorization.didRefresh = true
+            let failedToken = authorization.token
+            do {
+                authorization.token = try await bearerProvider.refreshBearerToken(
+                    afterUnauthorizedAccessToken: failedToken
+                )
+                guard await renewLease(
+                    summaries: summaries,
+                    leaseID: leaseID,
+                    ownerID: ownerID
+                ) else {
+                    return
+                }
+                let refreshed = try await send(
+                    summaries: summaries,
+                    installationID: installationID,
+                    token: authorization.token
+                )
+                await processResponse(
+                    refreshed,
+                    summaries: summaries,
+                    installationID: installationID,
+                    leaseID: leaseID,
+                    ownerID: ownerID,
+                    authorization: &authorization
+                )
+            } catch {
+                if Task.isCancelled {
+                    await repository.release(summaries: summaries, leaseID: leaseID)
+                    return
+                }
+                await scheduleRetry(
+                    summaries,
+                    leaseID: leaseID,
+                    response: response,
+                    category: .authentication,
+                    minimumDelay: configuration.maximumBackoff
+                )
+            }
+            return
+        }
+
+        await processResponse(
+            response,
+            summaries: summaries,
+            installationID: installationID,
+            leaseID: leaseID,
+            ownerID: ownerID,
+            authorization: &authorization
+        )
+    }
+
+    private func processResponse(
+        _ response: AnalyticsHTTPResponse,
+        summaries: [KeyboardUsageLeasedSummary],
+        installationID: UUID,
+        leaseID: String,
+        ownerID: String,
+        authorization: inout AuthorizationState
+    ) async {
+        guard !Task.isCancelled else {
+            await repository.release(summaries: summaries, leaseID: leaseID)
+            return
+        }
+        switch response.statusCode {
+        case 200:
+            let decoded: KeyboardUsageUploadResponse
+            do {
+                decoded = try JSONDecoder().decode(
+                    KeyboardUsageUploadResponse.self,
+                    from: response.body
+                )
+            } catch {
+                await scheduleRetry(
+                    summaries,
+                    leaseID: leaseID,
+                    response: response,
+                    category: .decoding
+                )
+                return
+            }
+            guard decoded.accepted + decoded.replayed == summaries.count else {
+                await scheduleRetry(
+                    summaries,
+                    leaseID: leaseID,
+                    response: response,
+                    category: .countMismatch
+                )
+                return
+            }
+            let completed = await repository.complete(
+                rowIDs: summaries.map(\.rowID),
+                leaseID: leaseID
+            )
+            log(
+                outcome: completed ? .uploaded : .retryScheduled,
+                count: summaries.count,
+                statusCode: response.statusCode,
+                attempt: maximumAttempt(in: summaries),
+                category: completed ? nil : .storage
+            )
+
+        case 400, 409, 422:
+            if summaries.count == 1 {
+                await repository.quarantine(
+                    rowIDs: [summaries[0].rowID],
+                    leaseID: leaseID,
+                    statusCode: response.statusCode
+                )
+                log(
+                    outcome: .quarantined,
+                    count: 1,
+                    statusCode: response.statusCode,
+                    attempt: summaries[0].attemptCount,
+                    category: .client
+                )
+                return
+            }
+            let midpoint = summaries.count / 2
+            await process(
+                Array(summaries[..<midpoint]),
+                installationID: installationID,
+                leaseID: leaseID,
+                ownerID: ownerID,
+                authorization: &authorization
+            )
+            await process(
+                Array(summaries[midpoint...]),
+                installationID: installationID,
+                leaseID: leaseID,
+                ownerID: ownerID,
+                authorization: &authorization
+            )
+
+        case 401:
+            await scheduleRetry(
+                summaries,
+                leaseID: leaseID,
+                response: response,
+                category: .authentication,
+                minimumDelay: configuration.maximumBackoff
+            )
+
+        case 408:
+            await scheduleRetry(
+                summaries,
+                leaseID: leaseID,
+                response: response,
+                category: .timeout
+            )
+
+        case 429:
+            await scheduleRetry(
+                summaries,
+                leaseID: leaseID,
+                response: response,
+                category: .rateLimited
+            )
+
+        case 500...599:
+            await scheduleRetry(
+                summaries,
+                leaseID: leaseID,
+                response: response,
+                category: .server
+            )
+
+        case 400...499:
+            await repository.quarantine(
+                rowIDs: summaries.map(\.rowID),
+                leaseID: leaseID,
+                statusCode: response.statusCode
+            )
+            log(
+                outcome: .quarantined,
+                count: summaries.count,
+                statusCode: response.statusCode,
+                attempt: maximumAttempt(in: summaries),
+                category: .client
+            )
+
+        default:
+            await scheduleRetry(
+                summaries,
+                leaseID: leaseID,
+                response: response,
+                category: .server
+            )
+        }
+    }
+
+    private func releaseForCancellation(
+        summaries: [KeyboardUsageLeasedSummary],
+        leaseID: String,
+        ownerID: String
+    ) async {
+        await repository.release(summaries: summaries, leaseID: leaseID)
+        await repository.releaseGlobalLease(ownerID: ownerID)
+    }
+
+    private func send(
+        summaries: [KeyboardUsageLeasedSummary],
+        installationID: UUID,
+        token: String?
+    ) async throws -> AnalyticsHTTPResponse {
+        var headers = [
+            "Accept": "application/json",
+            "Content-Type": "application/json"
+        ]
+        if let token, !token.isEmpty {
+            headers["Authorization"] = "Bearer \(token)"
+        }
+        return try await network.send(
+            AnalyticsHTTPRequest(
+                url: configuration.endpoint,
+                headers: headers,
+                body: Self.requestBody(
+                    summaries: summaries,
+                    installationID: installationID
+                )
+            )
+        )
+    }
+
+    private func renewLease(
+        summaries: [KeyboardUsageLeasedSummary],
+        leaseID: String,
+        ownerID: String
+    ) async -> Bool {
+        let renewed = await repository.renewLease(
+            ownerID: ownerID,
+            leaseID: leaseID,
+            configuration: configuration
+        )
+        guard renewed else {
+            await repository.release(summaries: summaries, leaseID: leaseID)
+            log(
+                outcome: .skipped,
+                count: summaries.count,
+                attempt: maximumAttempt(in: summaries),
+                category: .storage
+            )
+            return false
+        }
+        return true
+    }
+
+    private func scheduleRetry(
+        _ summaries: [KeyboardUsageLeasedSummary],
+        leaseID: String,
+        response: AnalyticsHTTPResponse?,
+        category: AnalyticsUploadErrorCategory,
+        minimumDelay: TimeInterval = 0
+    ) async {
+        let attempt = maximumAttempt(in: summaries) + 1
+        let exponent = min(attempt - 1, 16)
+        let ceiling = min(
+            configuration.maximumBackoff,
+            pow(2, Double(exponent))
+        )
+        let jitterMilliseconds = random.next(
+            upperBound: UInt64(max(0, ceiling * 1_000))
+        )
+        let jitter = TimeInterval(jitterMilliseconds) / 1_000
+        let retryAfter = response.flatMap(retryAfterDelay) ?? 0
+        let delay = min(
+            configuration.maximumBackoff,
+            max(minimumDelay, retryAfter, jitter)
+        )
+        await repository.scheduleRetry(
+            summaries: summaries,
+            leaseID: leaseID,
+            delay: delay
+        )
+        log(
+            outcome: .retryScheduled,
+            count: summaries.count,
+            statusCode: response?.statusCode,
+            attempt: attempt,
+            category: category
+        )
+    }
+
+    private func retryAfterDelay(
+        _ response: AnalyticsHTTPResponse
+    ) -> TimeInterval? {
+        guard let value = response.header(named: "Retry-After")?
+            .trimmingCharacters(in: .whitespacesAndNewlines) else {
+            return nil
+        }
+        if let seconds = TimeInterval(value) {
+            return min(configuration.maximumBackoff, max(0, seconds))
+        }
+        guard let date = Self.httpDateFormatter.date(from: value) else {
+            return nil
+        }
+        return min(
+            configuration.maximumBackoff,
+            max(0, date.timeIntervalSince(clock.now()))
+        )
+    }
+
+    private func maximumAttempt(
+        in summaries: [KeyboardUsageLeasedSummary]
+    ) -> Int {
+        summaries.map(\.attemptCount).max() ?? 0
+    }
+
+    private func log(
+        outcome: AnalyticsUploadLogEntry.Outcome,
+        count: Int,
+        statusCode: Int? = nil,
+        attempt: Int = 0,
+        category: AnalyticsUploadErrorCategory?
+    ) {
+        logger.log(
+            AnalyticsUploadLogEntry(
+                outcome: outcome,
+                eventCount: count,
+                statusCode: statusCode,
+                attempt: attempt,
+                errorCategory: category
+            )
+        )
+    }
+
+    private static func requestBody(
+        summaries: [KeyboardUsageLeasedSummary],
+        installationID: UUID
+    ) -> Data {
+        var body = Data(
+            #"{"installationId":"\#(installationID.uuidString.lowercased())","summaries":["#
+                .utf8
+        )
+        for index in summaries.indices {
+            if index > 0 {
+                body.append(UInt8(ascii: ","))
+            }
+            body.append(summaries[index].payload)
+        }
+        body.append(Data("]}".utf8))
+        return body
+    }
+
+    private static func networkCategory(
+        for error: Error
+    ) -> AnalyticsUploadErrorCategory {
+        guard let urlError = error as? URLError else { return .network }
+        switch urlError.code {
+        case .timedOut:
+            return .timeout
+        case .userAuthenticationRequired,
+             .userCancelledAuthentication:
+            return .authentication
+        default:
+            return .network
+        }
+    }
+
+    private static var httpDateFormatter: DateFormatter {
+        let formatter = DateFormatter()
+        formatter.locale = Locale(identifier: "en_US_POSIX")
+        formatter.timeZone = TimeZone(secondsFromGMT: 0)
+        formatter.dateFormat = "EEE',' dd MMM yyyy HH':'mm':'ss z"
+        return formatter
+    }
+}