history: add indexed search and context retrieval

README.md

@@ -229,15 +229,21 @@ memoryEnabled: true
 skillsEnabled: true
 # 是否启用好感度系统
 enableFavorabilitySystem: true
-# 聊天记录搜索最大天数
+# 未指定起始时间时聊天记录搜索默认回溯天数；明确指定时间时不限制历史跨度
 searchHistoryMaxDays: 30
-# 聊天记录搜索最大查询条数，防止内存溢出
+# 聊天记录搜索单页消息数上限，工具硬上限为200（兼容旧配置键）
 searchHistoryMaxRecords: 5000
 ```
 
 聊天记录与联系人快照保存在插件数据目录的 `chat-history.sqlite` 中，并使用 SQLite WAL 模式支持记录与查询并行进行。
 数据库由插件在首次启动时自动创建和维护，无需安装额外的聊天记录插件。
 
+聊天记录搜索使用 SQLite FTS5 中文三元索引。升级已有数据库时只会新增独立的派生搜索文本表和索引表，
+不会改列、重建或删除 `message_record` 原始记录；旧记录的搜索文本会在插件启动后分批后台回填。回填期间新消息仍会正常保存，
+搜索结果会明确标注索引尚未完成。搜索工具默认只查询当前群聊或当前私聊，明确指定 `from` 和 `to` 后可以跨越任意历史时间范围，
+并通过 `nextCursor` 分页。升级后新收到的消息还会记录发送者在该会话中使用过的名称，名称搜索不依赖对方仍是当前群成员；
+`getChatHistoryContext` 可按 `messageId` 获取命中消息前后的对话上下文。
+
 联系人刷新在后台通过 Overflow 的公开 `RemoteBot.executeAction` 调用 OneBot
 `get_friend_list`、`get_group_list` 和 `get_group_member_list`，不使用反射，也不依赖 Overflow 的 internal
 实现类。默认启动延迟 30 秒后刷新、此后每 24 小时刷新一次；单个群失败时保留上一版成员快照，完整刷新成功后
@@ -496,8 +502,12 @@ fallbackCooldownMinutes: 5
 10. **SendVoiceMessage** - 发送语音消息
 11. **ImageAgent** - 图像生成与编辑（文生图、单图编辑、多图融合）
 12. **WeatherService** - 天气查询
-13. **SearchChatHistory** - 按关键词、发送者、时间范围搜索插件内置 SQLite 聊天历史
-14. **QueryUserProfile** - 按当前发送者、QQ 号、群名片、昵称或好友备注读取长期画像，并针对该联系人按需读取公开资料卡
+13. **SearchChatHistory** - 在当前群聊或私聊中使用 SQLite 全文索引搜索聊天历史，支持发送者、时间范围和游标翻页
+14. **GetChatHistoryContext** - 根据历史消息 ID 获取目标消息前后的对话上下文
+15. **QueryUserProfile** - 按当前发送者、QQ 号、群名片、昵称或好友备注读取长期画像，并针对该联系人按需读取公开资料卡
+
+`SearchChatHistory` 的常用参数只有消息内容、发送者、时间范围和翻页游标；结果默认按最近消息返回，
+单页大小和匹配策略由插件控制。`senderId` 与 `senderName` 可以同时提供，此时 QQ 号作为精确筛选条件；有 QQ 号时名称不参与筛选。
 
 ### GitHub 查询工具
 

src/main/kotlin/JChatGPT.kt

@@ -1,5 +1,10 @@
 package top.jie65535.mirai
 
+import kotlinx.coroutines.CancellationException
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.isActive
+import kotlinx.coroutines.launch
 import net.mamoe.mirai.console.command.CommandManager.INSTANCE.register
 import net.mamoe.mirai.console.command.CommandSender.Companion.toCommandSender
 import net.mamoe.mirai.console.permission.PermissionId
@@ -48,6 +53,7 @@ object JChatGPT : KotlinPlugin(
     }
 ) {
     internal var includeHistory: Boolean = false
+    private var historyIndexJob: Job? = null
 
     val chatPermission = PermissionId("JChatGPT", "Chat")
 
@@ -69,6 +75,27 @@ object JChatGPT : KotlinPlugin(
             logger.error("初始化 SQLite 聊天记录失败，历史上下文与搜索将暂时禁用", cause)
             false
         }
+        if (includeHistory && ChatHistoryStore.isSearchIndexAvailable && !ChatHistoryStore.isSearchIndexReady) {
+            historyIndexJob = launch(Dispatchers.IO) {
+                try {
+                    val processed = ChatHistoryStore.backfillSearchIndex(
+                        shouldContinue = { isActive },
+                        onProgress = { count ->
+                            if (count % 10_000 == 0) {
+                                logger.info("聊天记录全文索引回填进度: 已处理 $count 条")
+                            }
+                        },
+                    )
+                    if (isActive && processed > 0) {
+                        logger.info("聊天记录全文索引回填完成: 共处理 $processed 条")
+                    }
+                } catch (cause: CancellationException) {
+                    throw cause
+                } catch (cause: Throwable) {
+                    logger.warning("聊天记录全文索引回填失败，后续启动将继续尝试", cause)
+                }
+            }
+        }
         if (includeHistory) {
             runCatching { ContactSnapshotStore.init(dataFolder) }
                 .onFailure { logger.error("初始化联系人快照数据库失败，联系人画像辅助将暂时禁用", it) }
@@ -103,6 +130,8 @@ object JChatGPT : KotlinPlugin(
     }
 
     override fun onDisable() {
+        historyIndexJob?.cancel()
+        historyIndexJob = null
         ConversationEngine.clear()
         ConversationContext.clearAll()
         ProfileAutoMaintenance.clear()

src/main/kotlin/config/PluginConfig.kt

@@ -292,9 +292,9 @@ object PluginConfig : AutoSavePluginConfig("Config") {
     @ValueDescription("单个工具调用返回内容的最大字符数，超过将被截断并标注")
     val maxToolOutputLength: Int by value(15000)
 
-    @ValueDescription("聊天记录搜索最大天数")
+    @ValueDescription("未指定起始时间时聊天记录搜索默认回溯天数；明确指定时间时不限制历史跨度")
     val searchHistoryMaxDays: Int by value(30)
 
-    @ValueDescription("聊天记录搜索最大查询条数，防止内存溢出")
+    @ValueDescription("聊天记录搜索单页消息数上限；工具硬上限为200，保留此配置键以兼容旧配置")
     val searchHistoryMaxRecords: Int by value(5000)
 }

src/main/kotlin/conversation/ConversationEngine.kt

@@ -29,6 +29,7 @@ import top.jie65535.mirai.tools.AdjustUserFavorabilityAgent
 import top.jie65535.mirai.tools.BaseAgent
 import top.jie65535.mirai.tools.DeleteSkill
 import top.jie65535.mirai.tools.GroupManageAgent
+import top.jie65535.mirai.tools.GetChatHistoryContext
 import top.jie65535.mirai.tools.GithubAgent
 import top.jie65535.mirai.tools.ImageAgent
 import top.jie65535.mirai.tools.LoadSkill
@@ -70,6 +71,7 @@ internal object ConversationEngine {
         SaveSkill(),
         DeleteSkill(),
         SearchChatHistory(),
+        GetChatHistoryContext(),
         QueryUserProfileAgent(),
         WebSearch(),
         GithubAgent(),

src/main/kotlin/data/ChatHistorySearch.kt

@@ -0,0 +1,69 @@
+package top.jie65535.mirai.data
+
+import net.mamoe.mirai.contact.Contact
+import net.mamoe.mirai.contact.Friend
+import net.mamoe.mirai.contact.Group
+import net.mamoe.mirai.contact.Member
+import net.mamoe.mirai.contact.Stranger
+import net.mamoe.mirai.message.data.MessageSourceKind
+
+data class ChatHistorySubject(
+    val botId: Long,
+    val kind: MessageSourceKind,
+    val subjectId: Long,
+) {
+    companion object {
+        fun from(contact: Contact): ChatHistorySubject = when (contact) {
+            is Group -> ChatHistorySubject(contact.bot.id, MessageSourceKind.GROUP, contact.id)
+            is Member -> ChatHistorySubject(contact.bot.id, MessageSourceKind.GROUP, contact.group.id)
+            is Friend -> ChatHistorySubject(contact.bot.id, MessageSourceKind.FRIEND, contact.id)
+            is Stranger -> ChatHistorySubject(contact.bot.id, MessageSourceKind.STRANGER, contact.id)
+            else -> error("不支持查询的联系人 $contact")
+        }
+    }
+}
+
+enum class ChatHistoryMatchMode {
+    ALL,
+    ANY,
+    PHRASE,
+}
+
+enum class ChatHistorySortOrder {
+    NEWEST,
+    OLDEST,
+}
+
+data class ChatHistoryCursor(
+    val time: Int,
+    val id: Long,
+)
+
+data class ChatHistorySearchRequest(
+    val subject: ChatHistorySubject,
+    val query: String? = null,
+    val matchMode: ChatHistoryMatchMode = ChatHistoryMatchMode.ALL,
+    val fromId: Long? = null,
+    val start: Int? = null,
+    val end: Int? = null,
+    val sortOrder: ChatHistorySortOrder = ChatHistorySortOrder.NEWEST,
+    val limit: Int = 20,
+    val cursor: ChatHistoryCursor? = null,
+)
+
+data class ChatHistorySearchPage(
+    val records: List<ChatMessageRecord>,
+    val totalMatches: Long?,
+    val nextCursor: ChatHistoryCursor?,
+)
+
+data class ChatHistoryContext(
+    val targetId: Long,
+    val records: List<ChatMessageRecord>,
+)
+
+data class ChatHistorySenderAliasMatch(
+    val userId: Long,
+    val displayName: String,
+    val matchRank: Int,
+)

src/main/kotlin/data/ChatHistorySearchText.kt

@@ -0,0 +1,133 @@
+package top.jie65535.mirai.data
+
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.JsonArray
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.json.JsonPrimitive
+import kotlinx.serialization.json.booleanOrNull
+import kotlinx.serialization.json.contentOrNull
+import kotlinx.serialization.json.longOrNull
+import net.mamoe.mirai.message.data.content
+
+object ChatHistorySearchText {
+    private const val MAX_INDEXED_CHARS = 16_384
+    private const val MAX_QUOTED_CHARS = 320
+    private const val MAX_FORWARD_NODES = 30
+    private const val MAX_FORWARD_NODE_CHARS = 500
+
+    private val json = Json { ignoreUnknownKeys = true }
+    private val whitespace = Regex("\\s+")
+
+    fun extract(code: String): String {
+        val rendered = runCatching { renderJsonCode(code) }
+            .recoverCatching { decodeMessageCode(code).content }
+            .getOrDefault("")
+        return rendered.normalize().takeUtf16Safely(MAX_INDEXED_CHARS)
+    }
+
+    private fun renderJsonCode(code: String): String {
+        val messages = json.parseToJsonElement(code) as? JsonArray
+            ?: throw IllegalArgumentException("消息记录不是 JSON array")
+        return renderMessages(messages)
+    }
+
+    private fun renderMessages(messages: JsonArray): String = messages.joinToString("") { element ->
+        val message = element as? JsonObject ?: return@joinToString ""
+        when (val type = message.string("type")) {
+            "PlainText" -> message.string("content").orEmpty()
+            "At" -> message.long("target")?.let { "@$it" }.orEmpty()
+            "AtAll" -> "@全体成员"
+            "Image", "FlashImage" -> if (message.boolean("isEmoji") == true) "[表情包]" else "[图片]"
+            "QuoteReply" -> renderQuote(message)
+            "ForwardMessage" -> renderForward(message)
+            "MessageOrigin", "MessageSource", "ShowImageFlag" -> ""
+            "Face", "MarketFace", "VipFace" -> "[表情]"
+            "Audio" -> "[语音]"
+            "FileMessage" -> "[文件${message.string("name")?.let { ": $it" }.orEmpty()}]"
+            "LightApp", "SimpleServiceMessage", "MusicShare" -> "[卡片消息]"
+            "PokeMessage" -> "[戳一戳]"
+            null -> ""
+            else -> message.string("content") ?: "[$type]"
+        }
+    }
+
+    private fun renderQuote(message: JsonObject): String {
+        val source = message["source"] as? JsonObject ?: return "[引用消息]"
+        val author = source.long("fromId")?.toString() ?: "其他用户"
+        val original = (source["originalMessage"] as? JsonArray)
+            ?.let(::renderMessages)
+            .orEmpty()
+            .normalize()
+            .takeUtf16Safely(MAX_QUOTED_CHARS)
+        return "[引用 $author: $original]"
+    }
+
+    private fun renderForward(message: JsonObject): String = buildString {
+        append("[转发消息]")
+        val nodes = message["nodeList"] as? JsonArray ?: return@buildString
+        nodes.take(MAX_FORWARD_NODES).forEach { element ->
+            val node = element as? JsonObject ?: return@forEach
+            val sender = node.string("senderName") ?: "未知用户"
+            val chain = node["messageChain"] as? JsonArray
+            append(' ').append(sender).append(": ")
+            append(
+                chain?.let(::renderMessages)
+                    .orEmpty()
+                    .normalize()
+                    .takeUtf16Safely(MAX_FORWARD_NODE_CHARS)
+            )
+        }
+        if (nodes.size > MAX_FORWARD_NODES) append(" ...[转发内容截断]")
+    }
+
+    private fun String.normalize(): String = whitespace.replace(this, " ")
+        .trim()
+        .replaceUnpairedSurrogates()
+
+    private fun String.takeUtf16Safely(maxLength: Int): String {
+        if (length <= maxLength) return this
+        val endIndex = if (maxLength > 0 &&
+            Character.isHighSurrogate(this[maxLength - 1]) &&
+            Character.isLowSurrogate(this[maxLength])
+        ) {
+            maxLength - 1
+        } else {
+            maxLength
+        }
+        return substring(0, endIndex)
+    }
+
+    private fun String.replaceUnpairedSurrogates(): String {
+        var output: StringBuilder? = null
+        var index = 0
+        while (index < length) {
+            val current = this[index]
+            when {
+                Character.isHighSurrogate(current) &&
+                        index + 1 < length && Character.isLowSurrogate(this[index + 1]) -> {
+                    output?.append(current)?.append(this[index + 1])
+                    index += 2
+                }
+                Character.isSurrogate(current) -> {
+                    if (output == null) output = StringBuilder(length).append(this, 0, index)
+                    output.append('\uFFFD')
+                    index++
+                }
+                else -> {
+                    output?.append(current)
+                    index++
+                }
+            }
+        }
+        return output?.toString() ?: this
+    }
+
+    private fun JsonObject.string(key: String): String? =
+        (get(key) as? JsonPrimitive)?.contentOrNull
+
+    private fun JsonObject.long(key: String): Long? =
+        (get(key) as? JsonPrimitive)?.longOrNull
+
+    private fun JsonObject.boolean(key: String): Boolean? =
+        (get(key) as? JsonPrimitive)?.booleanOrNull
+}

src/main/kotlin/data/ChatHistoryStore.kt

@@ -24,14 +24,26 @@ import java.sql.ResultSet
  * 写连接由 [writeLock] 串行保护；SQLite 使用 WAL + NORMAL synchronous，允许并发读取。
  */
 object ChatHistoryStore {
-    private const val SCHEMA_VERSION = 2
+    private const val SCHEMA_VERSION = 3
     private const val BUSY_TIMEOUT_MS = 30_000
+    private const val SEARCH_FTS_TABLE = "message_record_fts"
+    private const val SEARCH_TEXT_TABLE = "message_record_search"
+    private const val SENDER_ALIAS_TABLE = "chat_history_sender_alias"
+    private const val SEARCH_BACKFILL_CURSOR_KEY = "search_backfill_cursor"
+    private const val SEARCH_INDEX_COMPLETE_KEY = "search_index_complete"
+    private const val DEFAULT_BACKFILL_BATCH_SIZE = 250
+    private const val MAX_PAGE_SIZE = 200
+    private const val MAX_CONTEXT_MESSAGES = 100
 
     private val lifecycleLock = Any()
     private val writeLock = Any()
 
     @Volatile
     private var initialized = false
+    @Volatile
+    private var searchIndexAvailable = false
+    @Volatile
+    private var searchIndexReady = false
     private lateinit var databaseFile: File
     private var writeConnection: Connection? = null
     private var warningLogger: ((String, Throwable?) -> Unit)? = null
@@ -39,6 +51,12 @@ object ChatHistoryStore {
     val isAvailable: Boolean
         get() = initialized
 
+    val isSearchIndexAvailable: Boolean
+        get() = initialized && searchIndexAvailable
+
+    val isSearchIndexReady: Boolean
+        get() = isSearchIndexAvailable && searchIndexReady
+
     val databaseFileOrNull: File?
         get() = if (initialized) databaseFile else null
 
@@ -60,6 +78,8 @@ object ChatHistoryStore {
                 createSchema(connection)
                 writeConnection = connection
                 initialized = true
+                searchIndexAvailable = hasSearchIndex(connection)
+                searchIndexReady = searchIndexAvailable && readMeta(connection, SEARCH_INDEX_COMPLETE_KEY) == "1"
             } catch (cause: Throwable) {
                 connection.close()
                 throw cause
@@ -81,6 +101,8 @@ object ChatHistoryStore {
                 }
                 writeConnection = null
                 initialized = false
+                searchIndexAvailable = false
+                searchIndexReady = false
                 warningLogger = null
             }
         }
@@ -91,7 +113,7 @@ object ChatHistoryStore {
         val message = event.message.asSequence()
             .filterNot { it is MessageSource }
             .toMessageChain()
-        insert(ChatMessageRecord.fromSuccess(event.message.source, message))
+        insertRecord(ChatMessageRecord.fromSuccess(event.message.source, message), event.senderName)
     }
 
     fun record(event: MessagePostSendEvent<*>) {
@@ -100,7 +122,7 @@ object ChatHistoryStore {
         val message = event.message.asSequence()
             .filterNot { it is MessageSource }
             .toMessageChain()
-        insert(ChatMessageRecord.fromSuccess(source, message))
+        insertRecord(ChatMessageRecord.fromSuccess(source, message), event.bot.nick)
     }
 
     fun markRecalled(event: MessageRecallEvent) {
@@ -254,31 +276,410 @@ object ChatHistoryStore {
         }
     }
 
-    private fun insert(record: ChatMessageRecord) {
-        withWriteConnection { connection ->
+    fun search(request: ChatHistorySearchRequest): ChatHistorySearchPage {
+        check(initialized) { "聊天记录数据库尚未初始化" }
+        require(request.limit > 0) { "limit must be positive" }
+        require(request.start == null || request.end == null || request.start <= request.end) {
+            "start must not be after end"
+        }
+
+        val parameters = mutableListOf<Any>()
+        val conditions = subjectConditions(request.subject, parameters).toMutableList()
+        request.start?.let {
+            conditions += "mr.time >= ?"
+            parameters += it
+        }
+        request.end?.let {
+            conditions += "mr.time <= ?"
+            parameters += it
+        }
+        request.fromId?.let {
+            conditions += "mr.from_id = ?"
+            parameters += it
+        }
+
+        val query = request.query?.trim().orEmpty()
+        val textPredicate = buildTextPredicate(query, request.matchMode, parameters)
+        if ((textPredicate.usesFts || textPredicate.usesSearchText) && !isSearchIndexAvailable) {
+            error("聊天记录全文索引尚未就绪")
+        }
+        val joins = buildString {
+            if (textPredicate.usesSearchText) {
+                append("JOIN $SEARCH_TEXT_TABLE search ON search.message_id = mr.id ")
+            }
+            if (textPredicate.usesFts) {
+                append("JOIN $SEARCH_FTS_TABLE ON $SEARCH_FTS_TABLE.rowid = mr.id")
+            }
+        }
+        textPredicate.sql?.let(conditions::add)
+
+        request.cursor?.let { cursor ->
+            val operator = if (request.sortOrder == ChatHistorySortOrder.NEWEST) "<" else ">"
+            conditions += "(mr.time $operator ? OR (mr.time = ? AND mr.id $operator ?))"
+            parameters += cursor.time
+            parameters += cursor.time
+            parameters += cursor.id
+        }
+
+        val where = conditions.joinToString(" AND ")
+        val order = if (request.sortOrder == ChatHistorySortOrder.NEWEST) {
+            "mr.time DESC, mr.id DESC"
+        } else {
+            "mr.time ASC, mr.id ASC"
+        }
+        val records = openReadConnection().use { connection ->
+            val sql = """
+                SELECT mr.id, mr.bot_id, mr.from_id, mr.target_id, mr.ids, mr.internal_ids,
+                       mr.time, mr.kind, mr.code, mr.recalled
+                FROM message_record mr
+                $joins
+                WHERE $where
+                ORDER BY $order
+                LIMIT ?
+            """.trimIndent()
+            val queryParameters = parameters + (request.limit.coerceAtMost(MAX_PAGE_SIZE) + 1)
+            loadRecords(connection, sql, queryParameters)
+        }
+        val hasMore = records.size > request.limit.coerceAtMost(MAX_PAGE_SIZE)
+        val pageRecords = records.take(request.limit.coerceAtMost(MAX_PAGE_SIZE))
+        val last = pageRecords.lastOrNull()
+        val nextCursor = if (hasMore && last != null) {
+            ChatHistoryCursor(last.time, last.id)
+        } else {
+            null
+        }
+        val total = if (request.cursor == null) {
+            openReadConnection().use { connection ->
+                val sql = "SELECT COUNT(*) FROM message_record mr $joins WHERE $where"
+                connection.prepareStatement(sql).use { statement ->
+                    bindParameters(statement, parameters)
+                    statement.executeQuery().use { results ->
+                        check(results.next())
+                        results.getLong(1)
+                    }
+                }
+            }
+        } else {
+            null
+        }
+        return ChatHistorySearchPage(pageRecords, total, nextCursor)
+    }
+
+    fun findAround(
+        subject: ChatHistorySubject,
+        messageId: Long,
+        before: Int = 8,
+        after: Int = 8,
+    ): ChatHistoryContext? {
+        check(initialized) { "聊天记录数据库尚未初始化" }
+        require(before >= 0 && after >= 0) { "before and after must not be negative" }
+        require(before <= MAX_CONTEXT_MESSAGES && after <= MAX_CONTEXT_MESSAGES) {
+            "context window is too large"
+        }
+
+        return openReadConnection().use { connection ->
+            val targetParameters = mutableListOf<Any>()
+            val targetConditions = subjectConditions(subject, targetParameters).toMutableList()
+            targetConditions += "mr.id = ?"
+            targetParameters += messageId
+            val target = loadRecords(
+                connection,
+                """
+                    SELECT mr.id, mr.bot_id, mr.from_id, mr.target_id, mr.ids, mr.internal_ids,
+                           mr.time, mr.kind, mr.code, mr.recalled
+                    FROM message_record mr
+                    WHERE ${targetConditions.joinToString(" AND ")}
+                """.trimIndent(),
+                targetParameters,
+            ).firstOrNull() ?: return@use null
+
+            val beforeRecords = if (before == 0) {
+                emptyList()
+            } else {
+                val parameters = mutableListOf<Any>()
+                val conditions = subjectConditions(subject, parameters).toMutableList()
+                conditions += "(mr.time < ? OR (mr.time = ? AND mr.id < ?))"
+                parameters += target.time
+                parameters += target.time
+                parameters += target.id
+                conditions += "mr.id <> ?"
+                parameters += target.id
+                loadRecords(
+                    connection,
+                    """
+                        SELECT mr.id, mr.bot_id, mr.from_id, mr.target_id, mr.ids, mr.internal_ids,
+                               mr.time, mr.kind, mr.code, mr.recalled
+                        FROM message_record mr
+                        WHERE ${conditions.joinToString(" AND ")}
+                        ORDER BY mr.time DESC, mr.id DESC
+                        LIMIT ?
+                    """.trimIndent(),
+                    parameters + before,
+                ).asReversed()
+            }
+            val afterRecords = if (after == 0) {
+                emptyList()
+            } else {
+                val parameters = mutableListOf<Any>()
+                val conditions = subjectConditions(subject, parameters).toMutableList()
+                conditions += "(mr.time > ? OR (mr.time = ? AND mr.id > ?))"
+                parameters += target.time
+                parameters += target.time
+                parameters += target.id
+                conditions += "mr.id <> ?"
+                parameters += target.id
+                loadRecords(
+                    connection,
+                    """
+                        SELECT mr.id, mr.bot_id, mr.from_id, mr.target_id, mr.ids, mr.internal_ids,
+                               mr.time, mr.kind, mr.code, mr.recalled
+                        FROM message_record mr
+                        WHERE ${conditions.joinToString(" AND ")}
+                        ORDER BY mr.time ASC, mr.id ASC
+                        LIMIT ?
+                    """.trimIndent(),
+                    parameters + after,
+                )
+            }
+            ChatHistoryContext(messageId, beforeRecords + target + afterRecords)
+        }
+    }
+
+    fun findSenderAliases(
+        subject: ChatHistorySubject,
+        query: String,
+        limit: Int = 10,
+    ): List<ChatHistorySenderAliasMatch> {
+        check(initialized) { "聊天记录数据库尚未初始化" }
+        if (query.isBlank() || limit <= 0) return emptyList()
+        val normalized = query.trim()
+        return openReadConnection().use { connection ->
             connection.prepareStatement(
                 """
-                INSERT INTO message_record(
-                    bot_id, from_id, target_id, ids, internal_ids,
-                    time, kind, code, recalled
-                ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
+                SELECT user_id, name
+                FROM $SENDER_ALIAS_TABLE
+                WHERE bot_id = ? AND kind = ? AND subject_id = ?
+                  AND lower(name) LIKE ? ESCAPE '\'
+                ORDER BY last_seen DESC
+                LIMIT ?
                 """.trimIndent()
             ).use { statement ->
-                statement.setLong(1, record.botId)
-                statement.setLong(2, record.fromId)
-                statement.setLong(3, record.targetId)
-                statement.setString(4, record.ids)
-                statement.setString(5, record.internalIds)
-                statement.setInt(6, record.time)
-                statement.setInt(7, record.kind.ordinal)
-                statement.setString(8, record.code)
-                statement.setInt(9, record.recalled)
-                statement.executeUpdate()
+                statement.setLong(1, subject.botId)
+                statement.setInt(2, subject.kind.ordinal)
+                statement.setLong(3, subject.subjectId)
+                statement.setString(4, "%${normalized.lowercase().escapeLike()}%")
+                statement.setInt(5, limit.coerceAtMost(50))
+                statement.executeQuery().use { results ->
+                    buildList {
+                        while (results.next()) {
+                            val name = results.getString("name")
+                            add(
+                                ChatHistorySenderAliasMatch(
+                                    userId = results.getLong("user_id"),
+                                    displayName = name,
+                                    matchRank = name.aliasMatchRank(normalized),
+                                )
+                            )
+                        }
+                    }.sortedWith(compareBy({ it.matchRank }, { it.userId }))
+                        .distinctBy(ChatHistorySenderAliasMatch::userId)
+                        .take(limit)
+                }
             }
         }
     }
 
+    fun backfillSearchIndex(
+        batchSize: Int = DEFAULT_BACKFILL_BATCH_SIZE,
+        shouldContinue: () -> Boolean = { true },
+        onProgress: (processed: Int) -> Unit = {},
+    ): Int {
+        if (!isSearchIndexAvailable || batchSize <= 0) return 0
+        var processed = 0
+        var cursor = withWriteConnectionResult { connection ->
+            readMeta(connection, SEARCH_BACKFILL_CURSOR_KEY)?.toLongOrNull() ?: 0L
+        }
+        while (shouldContinue()) {
+            val batch = openReadConnection().use { connection ->
+                connection.prepareStatement(
+                    """
+                    SELECT mr.id, mr.code
+                    FROM message_record mr
+                    WHERE mr.id > ?
+                      AND NOT EXISTS (
+                          SELECT 1 FROM $SEARCH_TEXT_TABLE search WHERE search.message_id = mr.id
+                      )
+                    ORDER BY mr.id
+                    LIMIT ?
+                    """.trimIndent()
+                ).use { statement ->
+                    statement.setLong(1, cursor)
+                    statement.setInt(2, batchSize)
+                    statement.executeQuery().use { results ->
+                        buildList {
+                            while (results.next()) {
+                                add(results.getLong("id") to results.getString("code"))
+                            }
+                        }
+                    }
+                }
+            }
+            if (batch.isEmpty()) {
+                withWriteConnection { connection ->
+                    writeMeta(connection, SEARCH_INDEX_COMPLETE_KEY, "1")
+                }
+                searchIndexReady = true
+                return processed
+            }
+            withWriteConnection { connection ->
+                val oldAutoCommit = connection.autoCommit
+                connection.autoCommit = false
+                try {
+                    connection.prepareStatement(
+                        "INSERT INTO $SEARCH_TEXT_TABLE(message_id, search_text) VALUES (?, ?)"
+                    ).use { insertText ->
+                        connection.prepareStatement(
+                            "INSERT INTO $SEARCH_FTS_TABLE(rowid, search_text) VALUES (?, ?)"
+                        ).use { insertFts ->
+                            batch.forEach { (id, code) ->
+                                val text = ChatHistorySearchText.extract(code)
+                                insertText.setLong(1, id)
+                                insertText.setString(2, text)
+                                insertText.addBatch()
+                                insertFts.setLong(1, id)
+                                insertFts.setString(2, text)
+                                insertFts.addBatch()
+                            }
+                            insertText.executeBatch()
+                            insertFts.executeBatch()
+                        }
+                    }
+                    cursor = batch.last().first
+                    writeMeta(connection, SEARCH_BACKFILL_CURSOR_KEY, cursor.toString())
+                    writeMeta(connection, SEARCH_INDEX_COMPLETE_KEY, "0")
+                    connection.commit()
+                } catch (cause: Throwable) {
+                    connection.rollback()
+                    throw cause
+                } finally {
+                    connection.autoCommit = oldAutoCommit
+                }
+            }
+            processed += batch.size
+            onProgress(processed)
+        }
+        return processed
+    }
+
+    internal fun insertRecord(record: ChatMessageRecord, senderName: String = "") {
+        var recordId = 0L
+        var indexFailure: Throwable? = null
+        withWriteConnection { connection ->
+            recordId = insertPrimaryRecord(connection, record)
+            if (senderName.isNotBlank()) {
+                runCatching { upsertSenderAlias(connection, record, senderName) }
+                    .onFailure { warn("保存聊天记录发送者别名失败: user=${record.fromId}", it) }
+            }
+            if (isSearchIndexAvailable) {
+                runCatching { indexRecordOnConnection(connection, recordId, record.code) }
+                    .onFailure { indexFailure = it }
+            }
+        }
+        indexFailure?.let { cause ->
+            searchIndexReady = false
+            markSearchIndexIncomplete()
+            warn("消息已保存，但写入聊天记录全文索引失败: id=$recordId", cause)
+        }
+    }
+
+    private fun insertPrimaryRecord(connection: Connection, record: ChatMessageRecord): Long {
+        connection.prepareStatement(
+            """
+            INSERT INTO message_record(
+                bot_id, from_id, target_id, ids, internal_ids,
+                time, kind, code, recalled
+            ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
+            """.trimIndent()
+        ).use { statement ->
+            statement.setLong(1, record.botId)
+            statement.setLong(2, record.fromId)
+            statement.setLong(3, record.targetId)
+            statement.setString(4, record.ids)
+            statement.setString(5, record.internalIds)
+            statement.setInt(6, record.time)
+            statement.setInt(7, record.kind.ordinal)
+            statement.setString(8, record.code)
+            statement.setInt(9, record.recalled)
+            statement.executeUpdate()
+        }
+        connection.createStatement().use { statement ->
+            statement.executeQuery("SELECT last_insert_rowid()").use { results ->
+                check(results.next())
+                return results.getLong(1)
+            }
+        }
+    }
+
+    private fun indexRecordOnConnection(connection: Connection, recordId: Long, code: String) {
+        val searchText = ChatHistorySearchText.extract(code)
+        val oldAutoCommit = connection.autoCommit
+        connection.autoCommit = false
+        try {
+            connection.prepareStatement(
+                "INSERT INTO $SEARCH_TEXT_TABLE(message_id, search_text) VALUES (?, ?)"
+            ).use { statement ->
+                statement.setLong(1, recordId)
+                statement.setString(2, searchText)
+                statement.executeUpdate()
+            }
+            connection.prepareStatement(
+                "INSERT INTO $SEARCH_FTS_TABLE(rowid, search_text) VALUES (?, ?)"
+            ).use { statement ->
+                statement.setLong(1, recordId)
+                statement.setString(2, searchText)
+                statement.executeUpdate()
+            }
+            connection.commit()
+        } catch (cause: Throwable) {
+            connection.rollback()
+            throw cause
+        } finally {
+            connection.autoCommit = oldAutoCommit
+        }
+    }
+
+    private fun upsertSenderAlias(connection: Connection, record: ChatMessageRecord, senderName: String) {
+        val subjectId = if (record.kind == MessageSourceKind.GROUP) {
+            record.targetId
+        } else if (record.fromId == record.botId) {
+            record.targetId
+        } else {
+            record.fromId
+        }
+        connection.prepareStatement(
+            """
+            INSERT INTO $SENDER_ALIAS_TABLE(
+                bot_id, kind, subject_id, user_id, name, last_seen
+            ) VALUES (?, ?, ?, ?, ?, ?)
+            ON CONFLICT(bot_id, kind, subject_id, user_id, name) DO UPDATE SET
+                last_seen = MAX(last_seen, excluded.last_seen)
+            """.trimIndent()
+        ).use { statement ->
+            statement.setLong(1, record.botId)
+            statement.setInt(2, record.kind.ordinal)
+            statement.setLong(3, subjectId)
+            statement.setLong(4, record.fromId)
+            statement.setString(5, senderName.trim())
+            statement.setInt(6, record.time)
+            statement.executeUpdate()
+        }
+    }
+
     private fun withWriteConnection(block: (Connection) -> Unit) {
+        withWriteConnectionResult { connection -> block(connection) }
+    }
+
+    private fun <T> withWriteConnectionResult(block: (Connection) -> T): T {
         synchronized(writeLock) {
             check(initialized) { "聊天记录数据库尚未初始化" }
             val connection = writeConnection?.takeUnless(Connection::isClosed)
@@ -286,7 +687,7 @@ object ChatHistoryStore {
                     configureWriteConnection(it)
                     writeConnection = it
                 }
-            block(connection)
+            return block(connection)
         }
     }
 
@@ -313,53 +714,282 @@ object ChatHistoryStore {
     }
 
     private fun createSchema(connection: Connection) {
-        connection.createStatement().use { statement ->
-            statement.executeUpdate(
-                """
-                CREATE TABLE IF NOT EXISTS message_record(
-                    id INTEGER PRIMARY KEY AUTOINCREMENT,
-                    bot_id INTEGER NOT NULL,
-                    from_id INTEGER NOT NULL,
-                    target_id INTEGER NOT NULL,
-                    ids TEXT,
-                    internal_ids TEXT,
-                    time INTEGER NOT NULL,
-                    kind INTEGER NOT NULL,
-                    code TEXT NOT NULL,
-                    recalled INTEGER NOT NULL DEFAULT 0
+        val oldAutoCommit = connection.autoCommit
+        connection.autoCommit = false
+        try {
+            connection.createStatement().use { statement ->
+                statement.executeUpdate(
+                    """
+                    CREATE TABLE IF NOT EXISTS message_record(
+                        id INTEGER PRIMARY KEY AUTOINCREMENT,
+                        bot_id INTEGER NOT NULL,
+                        from_id INTEGER NOT NULL,
+                        target_id INTEGER NOT NULL,
+                        ids TEXT,
+                        internal_ids TEXT,
+                        time INTEGER NOT NULL,
+                        kind INTEGER NOT NULL,
+                        code TEXT NOT NULL,
+                        recalled INTEGER NOT NULL DEFAULT 0
+                    )
+                    """.trimIndent()
                 )
-                """.trimIndent()
-            )
-            statement.executeUpdate(
-                "CREATE INDEX IF NOT EXISTS idx_message_subject_time " +
-                        "ON message_record(bot_id, kind, target_id, time DESC, id DESC)"
-            )
-            statement.executeUpdate(
-                "CREATE INDEX IF NOT EXISTS idx_message_sender_subject_time " +
-                        "ON message_record(bot_id, kind, target_id, from_id, time DESC, id DESC)"
-            )
-            statement.executeUpdate(
-                "CREATE INDEX IF NOT EXISTS idx_message_recall_identity " +
-                        "ON message_record(bot_id, kind, target_id, from_id, time, ids)"
-            )
-            statement.executeUpdate(
-                """
-                CREATE TABLE IF NOT EXISTS chat_history_meta(
-                    key TEXT PRIMARY KEY,
-                    value TEXT NOT NULL
+                statement.executeUpdate(
+                    "CREATE INDEX IF NOT EXISTS idx_message_subject_time " +
+                            "ON message_record(bot_id, kind, target_id, time DESC, id DESC)"
                 )
-                """.trimIndent()
-            )
+                statement.executeUpdate(
+                    "CREATE INDEX IF NOT EXISTS idx_message_sender_subject_time " +
+                            "ON message_record(bot_id, kind, target_id, from_id, time DESC, id DESC)"
+                )
+                statement.executeUpdate(
+                    "CREATE INDEX IF NOT EXISTS idx_message_recall_identity " +
+                            "ON message_record(bot_id, kind, target_id, from_id, time, ids)"
+                )
+                statement.executeUpdate(
+                    """
+                    CREATE TABLE IF NOT EXISTS chat_history_meta(
+                        key TEXT PRIMARY KEY,
+                        value TEXT NOT NULL
+                    )
+                    """.trimIndent()
+                )
+                statement.executeUpdate(
+                    """
+                    CREATE TABLE IF NOT EXISTS $SEARCH_TEXT_TABLE(
+                        message_id INTEGER PRIMARY KEY,
+                        search_text TEXT NOT NULL
+                    )
+                    """.trimIndent()
+                )
+                statement.executeUpdate(
+                    """
+                    CREATE TABLE IF NOT EXISTS $SENDER_ALIAS_TABLE(
+                        bot_id INTEGER NOT NULL,
+                        kind INTEGER NOT NULL,
+                        subject_id INTEGER NOT NULL,
+                        user_id INTEGER NOT NULL,
+                        name TEXT NOT NULL,
+                        last_seen INTEGER NOT NULL,
+                        PRIMARY KEY(bot_id, kind, subject_id, user_id, name)
+                    )
+                    """.trimIndent()
+                )
+                statement.executeUpdate(
+                    "CREATE INDEX IF NOT EXISTS idx_chat_history_sender_alias_scope " +
+                            "ON $SENDER_ALIAS_TABLE(bot_id, kind, subject_id, last_seen DESC)"
+                )
+            }
+            connection.prepareStatement(
+                "INSERT INTO chat_history_meta(key, value) VALUES ('schema_version', ?) " +
+                        "ON CONFLICT(key) DO UPDATE SET value = excluded.value"
+            ).use { statement ->
+                statement.setString(1, SCHEMA_VERSION.toString())
+                statement.executeUpdate()
+            }
+            connection.commit()
+        } catch (cause: Throwable) {
+            connection.rollback()
+            throw cause
+        } finally {
+            connection.autoCommit = oldAutoCommit
         }
+
+        runCatching {
+            connection.createStatement().use { statement ->
+                statement.executeUpdate(
+                    """
+                    CREATE VIRTUAL TABLE IF NOT EXISTS $SEARCH_FTS_TABLE USING fts5(
+                        search_text,
+                        content='$SEARCH_TEXT_TABLE',
+                        content_rowid='message_id',
+                        tokenize='trigram'
+                    )
+                    """.trimIndent()
+                )
+            }
+        }.onFailure { warn("初始化 SQLite FTS5 聊天记录索引失败，消息记录仍会继续保存", it) }
+
+        if (hasSearchIndex(connection)) {
+            val hasMessages = connection.createStatement().use { statement ->
+                statement.executeQuery("SELECT 1 FROM message_record LIMIT 1").use(ResultSet::next)
+            }
+            connection.prepareStatement(
+                "INSERT INTO chat_history_meta(key, value) VALUES (?, ?) ON CONFLICT(key) DO NOTHING"
+            ).use { statement ->
+                statement.setString(1, SEARCH_BACKFILL_CURSOR_KEY)
+                statement.setString(2, "0")
+                statement.executeUpdate()
+                statement.setString(1, SEARCH_INDEX_COMPLETE_KEY)
+                statement.setString(2, if (hasMessages) "0" else "1")
+                statement.executeUpdate()
+            }
+        }
+    }
+
+    private fun subjectConditions(
+        subject: ChatHistorySubject,
+        parameters: MutableList<Any>,
+    ): List<String> {
+        val conditions = mutableListOf(
+            "mr.bot_id = ?",
+            "mr.kind = ?",
+        )
+        parameters += subject.botId
+        parameters += subject.kind.ordinal
+        if (subject.kind == MessageSourceKind.GROUP) {
+            conditions += "mr.target_id = ?"
+            parameters += subject.subjectId
+        } else {
+            conditions += "(mr.from_id = ? OR mr.target_id = ?)"
+            parameters += subject.subjectId
+            parameters += subject.subjectId
+        }
+        return conditions
+    }
+
+    private data class TextPredicate(
+        val sql: String?,
+        val usesFts: Boolean,
+        val usesSearchText: Boolean,
+    )
+
+    private fun buildTextPredicate(
+        query: String,
+        mode: ChatHistoryMatchMode,
+        parameters: MutableList<Any>,
+    ): TextPredicate {
+        if (query.isBlank()) return TextPredicate(null, false, false)
+        val normalized = query.lowercase()
+        val terms = normalized.split(Regex("\\s+")).filter(String::isNotBlank)
+        val hasShortTerm = terms.any { it.codePointCount(0, it.length) < 3 }
+        if (mode == ChatHistoryMatchMode.ANY && hasShortTerm) {
+            val predicates = terms.map {
+                parameters += it
+                "instr(lower(search.search_text), ?) > 0"
+            }
+            return TextPredicate(predicates.joinToString(" OR ", prefix = "(", postfix = ")"), false, true)
+        }
+        val ftsTerms = if (mode == ChatHistoryMatchMode.PHRASE) {
+            listOf(normalized)
+        } else {
+            terms
+        }
+        val ftsOnly = ftsTerms.filter { it.codePointCount(0, it.length) >= 3 }
+        if (ftsOnly.isEmpty()) {
+            val predicates = terms.map {
+                parameters += it
+                "instr(lower(search.search_text), ?) > 0"
+            }
+            val joiner = if (mode == ChatHistoryMatchMode.ANY) " OR " else " AND "
+            return TextPredicate(predicates.joinToString(joiner, prefix = "(", postfix = ")"), false, true)
+        }
+        val ftsQuery = when (mode) {
+            ChatHistoryMatchMode.PHRASE -> quoteFtsTerm(normalized)
+            ChatHistoryMatchMode.ALL -> ftsOnly.joinToString(" AND ", transform = ::quoteFtsTerm)
+            ChatHistoryMatchMode.ANY -> ftsOnly.joinToString(" OR ", transform = ::quoteFtsTerm)
+        }
+        parameters += ftsQuery
+        val ftsPredicate = "$SEARCH_FTS_TABLE MATCH ?"
+        if (mode != ChatHistoryMatchMode.ALL || !hasShortTerm) {
+            return TextPredicate(ftsPredicate, true, false)
+        }
+        val shortPredicates = terms.filter { it.codePointCount(0, it.length) < 3 }.map {
+            parameters += it
+            "instr(lower(search.search_text), ?) > 0"
+        }
+        return TextPredicate(
+            (listOf(ftsPredicate) + shortPredicates).joinToString(" AND ", prefix = "(", postfix = ")"),
+            true,
+            true,
+        )
+    }
+
+    private fun quoteFtsTerm(term: String): String =
+        "\"${term.replace("\"", "\"\"")}\""
+
+    private fun loadRecords(
+        connection: Connection,
+        sql: String,
+        parameters: List<Any>,
+    ): List<ChatMessageRecord> {
+        return connection.prepareStatement(sql).use { statement ->
+            bindParameters(statement, parameters)
+            statement.executeQuery().use { results ->
+                buildList {
+                    while (results.next()) add(results.toRecord())
+                }
+            }
+        }
+    }
+
+    private fun bindParameters(
+        statement: java.sql.PreparedStatement,
+        parameters: List<Any>,
+    ) {
+        parameters.forEachIndexed { index, value ->
+            when (value) {
+                is Int -> statement.setInt(index + 1, value)
+                is Long -> statement.setLong(index + 1, value)
+                is String -> statement.setString(index + 1, value)
+                else -> error("不支持的查询参数类型 ${value::class}")
+            }
+        }
+    }
+
+    private fun hasSearchIndex(connection: Connection): Boolean {
         connection.prepareStatement(
-            "INSERT INTO chat_history_meta(key, value) VALUES ('schema_version', ?) " +
-                    "ON CONFLICT(key) DO UPDATE SET value = excluded.value"
+            "SELECT 1 FROM sqlite_master WHERE type = 'table' AND name = ? LIMIT 1"
         ).use { statement ->
-            statement.setString(1, SCHEMA_VERSION.toString())
+            statement.setString(1, SEARCH_FTS_TABLE)
+            statement.executeQuery().use { results ->
+                return results.next()
+            }
+        }
+    }
+
+    private fun readMeta(connection: Connection, key: String): String? {
+        connection.prepareStatement(
+            "SELECT value FROM chat_history_meta WHERE key = ?"
+        ).use { statement ->
+            statement.setString(1, key)
+            statement.executeQuery().use { results ->
+                return if (results.next()) results.getString(1) else null
+            }
+        }
+    }
+
+    private fun writeMeta(connection: Connection, key: String, value: String) {
+        connection.prepareStatement(
+            """
+            INSERT INTO chat_history_meta(key, value) VALUES (?, ?)
+            ON CONFLICT(key) DO UPDATE SET value = excluded.value
+            """.trimIndent()
+        ).use { statement ->
+            statement.setString(1, key)
+            statement.setString(2, value)
             statement.executeUpdate()
         }
     }
 
+    private fun markSearchIndexIncomplete() {
+        runCatching {
+            withWriteConnection { connection ->
+                writeMeta(connection, SEARCH_INDEX_COMPLETE_KEY, "0")
+            }
+        }.onFailure { warn("标记聊天记录全文索引未完成失败", it) }
+    }
+
+    private fun String.escapeLike(): String =
+        replace("\\", "\\\\").replace("%", "\\%").replace("_", "\\_")
+
+    private fun String.aliasMatchRank(query: String): Int = when {
+        equals(query, ignoreCase = true) -> 0
+        startsWith(query, ignoreCase = true) -> 1
+        contains(query, ignoreCase = true) -> 2
+        else -> Int.MAX_VALUE
+    }
+
     private fun ResultSet.toRecord(): ChatMessageRecord {
         val kindOrdinal = getInt("kind")
         val kind = MessageSourceKind.values().getOrNull(kindOrdinal)

src/main/kotlin/data/ChatMessageRecord.kt

@@ -37,15 +37,7 @@ data class ChatMessageRecord(
     }
 
     fun toMessageChain(): MessageChain {
-        return try {
-            MessageChain.deserializeFromJsonString(code)
-        } catch (cause: SerializationException) {
-            try {
-                MiraiCode.deserializeMiraiCode(code)
-            } catch (_: Throwable) {
-                throw cause
-            }
-        }
+        return decodeMessageCode(code)
     }
 
     companion object {
@@ -69,3 +61,15 @@ data class ChatMessageRecord(
         }
     }
 }
+
+internal fun decodeMessageCode(code: String): MessageChain {
+    return try {
+        MessageChain.deserializeFromJsonString(code)
+    } catch (cause: SerializationException) {
+        try {
+            MiraiCode.deserializeMiraiCode(code)
+        } catch (_: Throwable) {
+            throw cause
+        }
+    }
+}

src/main/kotlin/tools/ChatHistoryToolFormatter.kt

@@ -0,0 +1,66 @@
+package top.jie65535.mirai.tools
+
+import net.mamoe.mirai.contact.nameCardOrNick
+import net.mamoe.mirai.event.events.GroupMessageEvent
+import net.mamoe.mirai.event.events.MessageEvent
+import top.jie65535.mirai.data.ChatHistorySearchText
+import top.jie65535.mirai.data.ChatMessageRecord
+import top.jie65535.mirai.data.ContactSnapshotStore
+import java.time.Instant
+import java.time.ZoneId
+import java.time.format.DateTimeFormatter
+
+internal object ChatHistoryToolFormatter {
+    private const val SNIPPET_LENGTH = 360
+    private val timeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")
+
+    fun appendRecords(
+        output: StringBuilder,
+        records: List<ChatMessageRecord>,
+        event: MessageEvent,
+        query: String? = null,
+        targetId: Long? = null,
+    ) {
+        val group = (event as? GroupMessageEvent)?.group
+        val userIds = records.map(ChatMessageRecord::fromId).distinct()
+        val snapshotNames = runCatching {
+            ContactSnapshotStore.loadDisplayNames(event.bot.id, group?.id, userIds)
+        }.getOrDefault(emptyMap())
+
+        records.forEach { record ->
+            val marker = if (record.id == targetId) ">>> " else ""
+            val sender = when {
+                record.fromId == event.bot.id -> "你"
+                group != null -> group[record.fromId]?.nameCardOrNick
+                    ?: snapshotNames[record.fromId]
+                    ?: "未知群员"
+                record.fromId == event.sender.id -> event.senderName
+                else -> snapshotNames[record.fromId] ?: "用户"
+            }
+            val time = timeFormatter.format(
+                Instant.ofEpochSecond(record.time.toLong()).atZone(ZoneId.systemDefault())
+            )
+            val content = buildSnippet(ChatHistorySearchText.extract(record.code), query)
+            output.append(marker)
+                .append("[messageId=").append(record.id).append("] ")
+                .append(time).append(' ')
+                .append(sender).append('(').append(record.fromId).append("): ")
+                .appendLine(content.ifEmpty { "[无文本消息]" })
+        }
+    }
+
+    private fun buildSnippet(content: String, query: String?): String {
+        if (content.length <= SNIPPET_LENGTH) return content
+        val terms = query.orEmpty().split(Regex("\\s+")).filter(String::isNotBlank)
+        val matchIndex = terms.mapNotNull { term ->
+            content.indexOf(term, ignoreCase = true).takeIf { it >= 0 }
+        }.minOrNull() ?: 0
+        val start = (matchIndex - SNIPPET_LENGTH / 3).coerceAtLeast(0)
+        val end = (start + SNIPPET_LENGTH).coerceAtMost(content.length)
+        return buildString {
+            if (start > 0) append("...")
+            append(content, start, end)
+            if (end < content.length) append("...")
+        }
+    }
+}

src/main/kotlin/tools/GetChatHistoryContext.kt

@@ -0,0 +1,83 @@
+package top.jie65535.mirai.tools
+
+import com.aallam.openai.api.chat.Tool
+import com.aallam.openai.api.core.Parameters
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.json.JsonPrimitive
+import kotlinx.serialization.json.intOrNull
+import kotlinx.serialization.json.jsonPrimitive
+import kotlinx.serialization.json.longOrNull
+import kotlinx.serialization.json.put
+import kotlinx.serialization.json.putJsonArray
+import kotlinx.serialization.json.putJsonObject
+import net.mamoe.mirai.event.events.MessageEvent
+import top.jie65535.mirai.JChatGPT
+import top.jie65535.mirai.data.ChatHistoryStore
+import top.jie65535.mirai.data.ChatHistorySubject
+
+class GetChatHistoryContext : BaseAgent(
+    tool = Tool.function(
+        name = "getChatHistoryContext",
+        description = "根据 searchChatHistory 返回的 messageId，读取该消息在当前群聊或私聊中的前后文。" +
+                "结果按时间顺序排列，并用 >>> 标记目标消息。",
+        parameters = Parameters.buildJsonObject {
+            put("type", "object")
+            putJsonObject("properties") {
+                putJsonObject("messageId") {
+                    put("type", "integer")
+                    put("description", "searchChatHistory 返回的稳定消息 ID")
+                }
+                putJsonObject("before") {
+                    put("type", "integer")
+                    put("description", "目标消息之前的消息数，默认8，最大15")
+                }
+                putJsonObject("after") {
+                    put("type", "integer")
+                    put("description", "目标消息之后的消息数，默认8，最大15")
+                }
+            }
+            putJsonArray("required") { add(JsonPrimitive("messageId")) }
+        },
+    )
+) {
+    override val isEnabled: Boolean
+        get() = JChatGPT.includeHistory
+
+    override val loadingMessage: String
+        get() = "读取聊天记录上下文中..."
+
+    override suspend fun execute(args: JsonObject?, event: MessageEvent): String {
+        val parameters = requireNotNull(args)
+        val messageId = parameters["messageId"]?.jsonPrimitive?.longOrNull
+            ?: return "缺少有效的 messageId"
+        val before = parameters["before"]?.jsonPrimitive?.intOrNull?.coerceIn(0, MAX_CONTEXT) ?: DEFAULT_CONTEXT
+        val after = parameters["after"]?.jsonPrimitive?.intOrNull?.coerceIn(0, MAX_CONTEXT) ?: DEFAULT_CONTEXT
+        val context = try {
+            ChatHistoryStore.findAround(
+                subject = ChatHistorySubject.from(event.subject),
+                messageId = messageId,
+                before = before,
+                after = after,
+            )
+        } catch (cause: Throwable) {
+            JChatGPT.logger.warning("读取聊天记录上下文失败: messageId=$messageId", cause)
+            return "读取聊天记录上下文失败: ${cause.message}"
+        } ?: return "当前会话中不存在 messageId=$messageId 的消息"
+
+        return buildString {
+            appendLine("目标消息及上下文（共 ${context.records.size} 条）：")
+            appendLine()
+            ChatHistoryToolFormatter.appendRecords(
+                output = this,
+                records = context.records,
+                event = event,
+                targetId = context.targetId,
+            )
+        }.trimEnd()
+    }
+
+    companion object {
+        private const val DEFAULT_CONTEXT = 8
+        private const val MAX_CONTEXT = 15
+    }
+}

src/main/kotlin/tools/SearchChatHistory.kt

@@ -2,57 +2,69 @@ package top.jie65535.mirai.tools
 
 import com.aallam.openai.api.chat.Tool
 import com.aallam.openai.api.core.Parameters
-import kotlinx.serialization.json.*
-import net.mamoe.mirai.contact.Group
-import net.mamoe.mirai.contact.nameCardOrNick
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.json.contentOrNull
+import kotlinx.serialization.json.jsonPrimitive
+import kotlinx.serialization.json.longOrNull
+import kotlinx.serialization.json.put
+import kotlinx.serialization.json.putJsonObject
 import net.mamoe.mirai.event.events.GroupMessageEvent
 import net.mamoe.mirai.event.events.MessageEvent
-import net.mamoe.mirai.message.data.Image
-import net.mamoe.mirai.message.data.Image.Key.queryUrl
-import net.mamoe.mirai.message.data.SingleMessage
-import net.mamoe.mirai.message.data.content
+import net.mamoe.mirai.contact.nameCardOrNick
 import top.jie65535.mirai.JChatGPT
 import top.jie65535.mirai.config.PluginConfig
+import top.jie65535.mirai.data.ChatHistoryCursor
+import top.jie65535.mirai.data.ChatHistoryMatchMode
+import top.jie65535.mirai.data.ChatHistorySearchRequest
+import top.jie65535.mirai.data.ChatHistorySortOrder
 import top.jie65535.mirai.data.ChatHistoryStore
-import top.jie65535.mirai.data.ChatMessageRecord
-import java.time.Instant
+import top.jie65535.mirai.data.ChatHistorySubject
+import top.jie65535.mirai.data.ContactNameMatch
+import top.jie65535.mirai.data.ContactSnapshotStore
+import java.nio.charset.StandardCharsets
+import java.time.LocalDate
 import java.time.LocalDateTime
 import java.time.OffsetDateTime
 import java.time.ZoneId
 import java.time.format.DateTimeFormatter
 import java.time.format.DateTimeParseException
+import java.util.Base64
 
 class SearchChatHistory : BaseAgent(
     tool = Tool.function(
         name = "searchChatHistory",
-        description = "搜索群聊消息历史，可按关键词、发送者、时间范围筛选。用于回溯之前的讨论、查找某人说过的话、统计话题等。" +
-                "不指定时间范围时默认搜索最近30天。指定时间时范围不能超过30天，如需更长跨度可分多次查询。" +
-                "可以通过多轮搜索来实现找到某条消息的上下文。",
+        description = "在当前群聊或私聊的 SQLite 历史中搜索消息，可按内容、发送者和时间筛选。" +
+                "默认返回最近匹配并在结果过多时提供 cursor；需要查看命中消息前后讨论时调用 getChatHistoryContext。" +
+                "未指定 from 时默认搜索配置的近期天数，明确指定时间时可以搜索任意历史跨度。",
         parameters = Parameters.buildJsonObject {
             put("type", "object")
             putJsonObject("properties") {
-                putJsonObject("keyword") {
+                putJsonObject("query") {
                     put("type", "string")
-                    put("description", "消息内容关键词，人名请用sender")
+                    put("description", "要搜索的消息文本；省略时按其他条件浏览时间线")
                 }
-                putJsonObject("sender") {
-                    put("type", "string")
-                    put("description", "发送者名称或QQ号，查找某人的发言")
-                }
-                putJsonObject("startTime") {
-                    put("type", "string")
-                    put("description", "起始时间，格式：yyyy-MM-dd HH:mm，不填则默认为7天前")
-                }
-                putJsonObject("endTime") {
-                    put("type", "string")
-                    put("description", "结束时间，格式同上，不填则默认到当前时间")
-                }
-                putJsonObject("limit") {
+                putJsonObject("senderId") {
                     put("type", "integer")
-                    put("description", "返回消息数量上限，默认20，最大200")
+                    put("description", "发送者 QQ 号；仅在用户明确给出或上下文可靠提供 QQ 号时使用，不要根据昵称猜测")
+                }
+                putJsonObject("senderName") {
+                    put("type", "string")
+                    put("description", "用户用名称指代发送者时优先原样传入群名片、昵称或好友备注；可与 senderId 同时提供，没有 senderId 时解析发送者，有重名时返回候选 QQ 号")
+                }
+                putJsonObject("from") {
+                    put("type", "string")
+                    put("description", "起始时间，格式 yyyy-MM-dd HH:mm 或 yyyy-MM-dd")
+                }
+                putJsonObject("to") {
+                    put("type", "string")
+                    put("description", "结束时间，格式 yyyy-MM-dd HH:mm 或 yyyy-MM-dd；仅日期表示当天结束")
+                }
+                putJsonObject("cursor") {
+                    put("type", "string")
+                    put("description", "上一页返回的 nextCursor；继续同一搜索时原样传回")
                 }
             }
-        }
+        },
     )
 ) {
     override val isEnabled: Boolean
@@ -62,151 +74,190 @@ class SearchChatHistory : BaseAgent(
         get() = "搜索聊天记录中..."
 
     override suspend fun execute(args: JsonObject?, event: MessageEvent): String {
-        requireNotNull(args)
-
-        val keyword = args["keyword"]?.jsonPrimitive?.contentOrNull
-        val sender = args["sender"]?.jsonPrimitive?.contentOrNull
-
-        val maxDays = PluginConfig.searchHistoryMaxDays
+        val parameters = args ?: JsonObject(emptyMap())
+        val query = parameters.string("query")?.trim()?.takeIf(String::isNotEmpty)
+        val matchMode = ChatHistoryMatchMode.ALL
+        val sortOrder = ChatHistorySortOrder.NEWEST
         val now = OffsetDateTime.now()
-
-        val startTime = args["startTime"]?.jsonPrimitive?.contentOrNull?.let {
-            parseTime(it) ?: return "startTime 格式错误，请使用 yyyy-MM-dd HH:mm"
-        } ?: now.minusDays(maxDays.toLong())
-
-        val endTime = args["endTime"]?.jsonPrimitive?.contentOrNull?.let {
-            parseTime(it) ?: return "endTime 格式错误，请使用 yyyy-MM-dd HH:mm"
+        val start = parameters.string("from")?.let {
+            parseTime(it, endOfDay = false) ?: return "from 格式错误，请使用 yyyy-MM-dd HH:mm 或 yyyy-MM-dd"
+        } ?: now.minusDays(PluginConfig.searchHistoryMaxDays.coerceAtLeast(1).toLong())
+        val end = parameters.string("to")?.let {
+            parseTime(it, endOfDay = true) ?: return "to 格式错误，请使用 yyyy-MM-dd HH:mm 或 yyyy-MM-dd"
         } ?: now
+        if (start > end) return "起始时间必须早于或等于结束时间"
 
-        if (startTime >= endTime) {
-            return "起始时间必须早于结束时间"
-        }
-
-        if (java.time.Duration.between(startTime, endTime).toDays() > maxDays) {
-            return "搜索时间范围不能超过 ${maxDays}天，请缩小范围后重试"
-        }
-
-        val senderQq = resolveSenderQq(sender, event)
-        val startEpoch = startTime.toEpochSecond().toInt()
-        val endEpoch = endTime.toEpochSecond().toInt()
-        val maxRecords = PluginConfig.searchHistoryMaxRecords
-
-        val records = try {
-            ChatHistoryStore.query(
-                contact = event.subject,
-                start = startEpoch,
-                end = endEpoch,
-                limit = maxRecords,
-                fromId = senderQq,
-            ).sortedWith(compareBy<ChatMessageRecord> { it.time }.thenBy { it.id })
-        } catch (e: Throwable) {
-            JChatGPT.logger.warning("查询消息历史失败", e)
-            return "查询消息历史失败: ${e.message}"
-        }
-
-        var filtered = records
-
-        // 消息内容在数据库中是序列化存储的，关键词只能在内存中过滤
-        if (keyword != null) {
-            filtered = filtered.filter {
-                it.toMessageChain().content.contains(keyword, ignoreCase = true)
+        val senderId = parameters["senderId"]?.jsonPrimitive?.longOrNull
+        val senderName = parameters.string("senderName")?.trim()?.takeIf(String::isNotEmpty)
+        val resolvedSenderId = senderId ?: senderName?.let { name ->
+            when (val resolution = resolveSender(name, event)) {
+                is SenderResolution.Found -> resolution.userId
+                is SenderResolution.Ambiguous -> return buildString {
+                    appendLine("找到多个名称匹配的发送者，请改用 senderId：")
+                    resolution.candidates.forEach { candidate ->
+                        appendLine("- ${candidate.displayName} (${candidate.userId})")
+                    }
+                }.trimEnd()
+                SenderResolution.NotFound -> return "没有找到名称匹配的发送者：$name"
             }
         }
 
-        if (filtered.isEmpty()) {
-            return "未找到匹配的聊天记录"
+        val outputSafePageSize = ((PluginConfig.maxToolOutputLength.coerceAtLeast(1) - OUTPUT_RESERVE_CHARS)
+            .coerceAtLeast(APPROXIMATE_RECORD_CHARS) / APPROXIMATE_RECORD_CHARS)
+            .coerceIn(1, MAX_PAGE_SIZE)
+        val configuredPageSize = minOf(
+            PluginConfig.searchHistoryMaxRecords.coerceIn(1, MAX_PAGE_SIZE),
+            outputSafePageSize,
+        )
+        val pageSize = DEFAULT_PAGE_SIZE.coerceAtMost(configuredPageSize)
+        val cursor = parameters.string("cursor")?.let {
+            decodeCursor(it, sortOrder) ?: return "cursor 无效，请重新开始搜索"
+        }
+        if (query != null && query.codePointCount(0, query.length) >= 3 &&
+            !ChatHistoryStore.isSearchIndexAvailable
+        ) {
+            return "聊天记录全文索引当前不可用，无法执行关键词搜索"
         }
 
-        val limit = args["limit"]?.jsonPrimitive?.intOrNull?.coerceIn(1, 200) ?: 20
-        val total = filtered.size
-        val result = filtered.takeLast(limit)
+        val request = ChatHistorySearchRequest(
+            subject = ChatHistorySubject.from(event.subject),
+            query = query,
+            matchMode = matchMode,
+            fromId = resolvedSenderId,
+            start = start.toEpochSecond().toInt(),
+            end = end.toEpochSecond().toInt(),
+            sortOrder = sortOrder,
+            limit = pageSize,
+            cursor = cursor,
+        )
+        val page = try {
+            ChatHistoryStore.search(request)
+        } catch (cause: Throwable) {
+            JChatGPT.logger.warning("查询消息历史失败", cause)
+            return "查询消息历史失败: ${cause.message}"
+        }
+
+        if (page.records.isEmpty()) {
+            if (query != null && resolvedSenderId != null && cursor == null) {
+                val withoutSender = runCatching {
+                    ChatHistoryStore.search(
+                        request.copy(
+                            fromId = null,
+                            limit = DIAGNOSTIC_PAGE_SIZE,
+                            cursor = ChatHistoryCursor(request.end ?: Int.MAX_VALUE, Long.MAX_VALUE),
+                        )
+                    )
+                }.getOrNull()
+                if (withoutSender?.records?.isNotEmpty() == true) {
+                    return buildString {
+                        append("未找到发送者 $resolvedSenderId 的匹配记录。")
+                        appendLine("去掉发送者筛选后找到了匹配消息，可能是 QQ 号不正确；示例：")
+                        ChatHistoryToolFormatter.appendRecords(this, withoutSender.records, event, query)
+                    }.trimEnd()
+                }
+            }
+            return if (!ChatHistoryStore.isSearchIndexReady && query != null) {
+                "未找到匹配的聊天记录。历史全文索引仍在后台构建，当前结果可能不完整。"
+            } else if (resolvedSenderId != null) {
+                "未找到发送者 $resolvedSenderId 在当前聊天和时间范围内的匹配记录"
+            } else {
+                "未找到匹配的聊天记录"
+            }
+        }
 
         return buildString {
-            appendLine("找到 $total 条匹配记录，显示最近 ${result.size} 条：")
+            page.totalMatches?.let { total -> appendLine("找到 $total 条匹配记录，本页 ${page.records.size} 条：") }
+                ?: appendLine("继续搜索，本页 ${page.records.size} 条：")
+            page.nextCursor?.let { next ->
+                appendLine("hasMore: true")
+                appendLine("nextCursor: ${encodeCursor(next, sortOrder)}")
+            } ?: appendLine("hasMore: false")
             appendLine()
-            appendHistory(this, result, event)
-        }
+            ChatHistoryToolFormatter.appendRecords(this, page.records, event, query)
+            if (!ChatHistoryStore.isSearchIndexReady && query != null) {
+                appendLine()
+                append("[索引状态] 历史全文索引仍在后台构建，当前结果可能不完整。")
+            }
+        }.trimEnd()
     }
 
-    /**
-     * 将 sender 解析为 QQ 号，优先尝试纯数字，再尝试群成员名称匹配
-     */
-    private fun resolveSenderQq(sender: String?, event: MessageEvent): Long? {
-        if (sender == null) return null
-        sender.toLongOrNull()?.let { return it }
+    private fun resolveSender(name: String, event: MessageEvent): SenderResolution {
+        val groupId = (event as? GroupMessageEvent)?.group?.id
+        val matches = runCatching {
+            ContactSnapshotStore.findUsersByName(event.bot.id, groupId, name, limit = 6)
+        }.getOrDefault(emptyList()).toMutableList()
+        runCatching {
+            ChatHistoryStore.findSenderAliases(ChatHistorySubject.from(event.subject), name, limit = 6)
+        }.getOrDefault(emptyList()).forEach { alias ->
+            if (matches.none { it.userId == alias.userId }) {
+                matches += ContactNameMatch(alias.userId, alias.displayName, alias.matchRank)
+            }
+        }
         if (event is GroupMessageEvent) {
-            return event.group.members.firstOrNull {
-                it.nameCardOrNick.contains(sender, ignoreCase = true)
-            }?.id
-        }
-        return null
-    }
-
-    private suspend fun appendHistory(
-        sb: StringBuilder,
-        records: List<ChatMessageRecord>,
-        event: MessageEvent
-    ) {
-        val timeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")
-        var lastFromId = 0L
-
-        for (record in records) {
-            val showSender = lastFromId != record.fromId
-            if (showSender) {
-                sb.appendLine()
-                if (event is GroupMessageEvent) {
-                    if (event.bot.id == record.fromId) {
-                        sb.append("**你** ").append(event.bot.nameCardOrNick)
-                    } else {
-                        sb.append(getNameCard(event.group, record.fromId))
+            event.group.members.asSequence()
+                .filter { it.nameCardOrNick.contains(name, ignoreCase = true) }
+                .forEach { member ->
+                    if (matches.none { it.userId == member.id }) {
+                        matches += ContactNameMatch(member.id, member.nameCardOrNick, 10)
                     }
                 }
-                sb.append(" ")
-                    .append(timeFormatter.format(
-                        Instant.ofEpochSecond(record.time.toLong()).atZone(ZoneId.systemDefault())
-                    ))
-                    .append("：")
-            }
-            for (msg in record.toMessageChain()) {
-                sb.append(singleMessageToText(msg, event.subject.id))
-            }
-            sb.appendLine()
-            lastFromId = record.fromId
+        }
+        val sorted = matches.sortedWith(compareBy({ it.matchRank }, { it.userId }))
+        val first = sorted.firstOrNull() ?: return SenderResolution.NotFound
+        val second = sorted.getOrNull(1)
+        return if (second == null || first.matchRank < second.matchRank) {
+            SenderResolution.Found(first.userId)
+        } else {
+            SenderResolution.Ambiguous(sorted)
         }
     }
 
-    private suspend fun singleMessageToText(msg: SingleMessage, subjectId: Long): String {
-        return when (msg) {
-            is Image -> {
-                try {
-                    val imageUrl = msg.queryUrl()
-                    val index = JChatGPT.registerImage(subjectId, msg.imageId, imageUrl)
-                        ?: return msg.content
-                    "[${if (msg.isEmoji) "表情包" else "图片"}$index]"
-                } catch (_: Throwable) {
-                    msg.content
-                }
-            }
-            else -> msg.content
-        }
-    }
-
-    private fun getNameCard(group: Group, qq: Long): String {
-        val member = group[qq]
-        return member?.nameCardOrNick ?: "未知群员($qq)"
+    private sealed interface SenderResolution {
+        data class Found(val userId: Long) : SenderResolution
+        data class Ambiguous(val candidates: List<ContactNameMatch>) : SenderResolution
+        data object NotFound : SenderResolution
     }
 
     companion object {
-        private val timeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm")
+        private const val DEFAULT_PAGE_SIZE = 20
+        private const val DIAGNOSTIC_PAGE_SIZE = 6
+        private const val MAX_PAGE_SIZE = 200
+        private const val OUTPUT_RESERVE_CHARS = 1_000
+        private const val APPROXIMATE_RECORD_CHARS = 450
+        private val dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm")
+        private val dateFormatter = DateTimeFormatter.ISO_LOCAL_DATE
 
-        fun parseTime(text: String): OffsetDateTime? {
+        fun parseTime(text: String, endOfDay: Boolean): OffsetDateTime? {
+            val zone = ZoneId.systemDefault()
             return try {
-                LocalDateTime.parse(text, timeFormatter)
-                    .atZone(ZoneId.systemDefault())
-                    .toOffsetDateTime()
+                LocalDateTime.parse(text, dateTimeFormatter).atZone(zone).toOffsetDateTime()
             } catch (_: DateTimeParseException) {
-                null
+                try {
+                    val date = LocalDate.parse(text, dateFormatter)
+                    val localDateTime = if (endOfDay) date.plusDays(1).atStartOfDay().minusNanos(1) else date.atStartOfDay()
+                    localDateTime.atZone(zone).toOffsetDateTime()
+                } catch (_: DateTimeParseException) {
+                    null
+                }
             }
         }
+
+        private fun encodeCursor(cursor: ChatHistoryCursor, sortOrder: ChatHistorySortOrder): String {
+            val raw = "${sortOrder.name}:${cursor.time}:${cursor.id}"
+            return Base64.getUrlEncoder().withoutPadding()
+                .encodeToString(raw.toByteArray(StandardCharsets.UTF_8))
+        }
+
+        private fun decodeCursor(text: String, sortOrder: ChatHistorySortOrder): ChatHistoryCursor? {
+            return runCatching {
+                val raw = String(Base64.getUrlDecoder().decode(text), StandardCharsets.UTF_8)
+                val parts = raw.split(':')
+                if (parts.size != 3 || parts[0] != sortOrder.name) return null
+                ChatHistoryCursor(parts[1].toInt(), parts[2].toLong())
+            }.getOrNull()
+        }
+
+        private fun JsonObject.string(key: String): String? =
+            get(key)?.jsonPrimitive?.contentOrNull
     }
 }

src/test/kotlin/data/ChatHistoryStoreTest.kt

@@ -5,7 +5,14 @@ import java.sql.DriverManager
 import kotlin.io.path.absolutePathString
 import kotlin.test.Test
 import kotlin.test.assertEquals
+import kotlin.test.assertFalse
+import kotlin.test.assertNotNull
 import kotlin.test.assertTrue
+import net.mamoe.mirai.message.data.MessageSourceKind
+import top.jie65535.mirai.data.ChatHistoryMatchMode.PHRASE
+import kotlinx.serialization.json.buildJsonArray
+import kotlinx.serialization.json.buildJsonObject
+import kotlinx.serialization.json.put
 
 class ChatHistoryStoreTest {
     @Test
@@ -55,7 +62,15 @@ class ChatHistoryStoreTest {
                         "SELECT value FROM chat_history_meta WHERE key = 'schema_version'"
                     ).use { results ->
                         assertTrue(results.next())
-                        assertEquals("2", results.getString(1))
+                        assertEquals("3", results.getString(1))
+                    }
+                    statement.executeQuery(
+                        "SELECT COUNT(*) FROM sqlite_master " +
+                                "WHERE type = 'table' AND name IN " +
+                                "('message_record_search', 'message_record_fts', 'chat_history_sender_alias')"
+                    ).use { results ->
+                        assertTrue(results.next())
+                        assertEquals(3, results.getInt(1))
                     }
                 }
             }
@@ -64,4 +79,204 @@ class ChatHistoryStoreTest {
             directory.toFile().deleteRecursively()
         }
     }
+
+    @Test
+    fun searchesChineseTextInDatabaseAndSupportsCursorAndContext() {
+        val directory = Files.createTempDirectory("jchatgpt-history-search-test-")
+        try {
+            ChatHistoryStore.init(directory.toFile())
+            val first = insert(directory, 100, 11, "部署失败，需要回滚", senderName = "旧名张三")
+            val second = insert(directory, 101, 12, "部署成功，服务已恢复")
+            val third = insert(directory, 102, 11, "确认部署失败的原因")
+
+            val subject = ChatHistorySubject(1, MessageSourceKind.GROUP, 1000)
+            val firstPage = ChatHistoryStore.search(
+                ChatHistorySearchRequest(
+                    subject = subject,
+                    query = "部署失败",
+                    matchMode = PHRASE,
+                    start = 0,
+                    end = 200,
+                    limit = 1,
+                )
+            )
+            assertEquals(2L, firstPage.totalMatches)
+            assertEquals(third, firstPage.records.single().id)
+            assertNotNull(firstPage.nextCursor)
+
+            val secondPage = ChatHistoryStore.search(
+                ChatHistorySearchRequest(
+                    subject = subject,
+                    query = "部署失败",
+                    matchMode = PHRASE,
+                    start = 0,
+                    end = 200,
+                    limit = 1,
+                    cursor = firstPage.nextCursor,
+                )
+            )
+            assertEquals(null, secondPage.totalMatches)
+            assertEquals(first, secondPage.records.single().id)
+            assertFalse(secondPage.nextCursor != null)
+
+            val context = ChatHistoryStore.findAround(subject, second, before = 1, after = 1)
+            assertNotNull(context)
+            assertEquals(listOf(first, second, third), context.records.map { it.id })
+
+            val shortQuery = ChatHistoryStore.search(
+                ChatHistorySearchRequest(
+                    subject = subject,
+                    query = "部署",
+                    fromId = 11,
+                    start = 0,
+                    end = 200,
+                    sortOrder = ChatHistorySortOrder.OLDEST,
+                    limit = 10,
+                )
+            )
+            assertEquals(2L, shortQuery.totalMatches)
+            assertEquals(listOf(first, third), shortQuery.records.map { it.id })
+
+            val aliases = ChatHistoryStore.findSenderAliases(subject, "旧名")
+            assertEquals(listOf(ChatHistorySenderAliasMatch(11, "旧名张三", 1)), aliases)
+        } finally {
+            ChatHistoryStore.close()
+            directory.toFile().deleteRecursively()
+        }
+    }
+
+    @Test
+    fun migratesExistingSchemaAndBackfillsSearchTextWithoutReplacingMessageTable() {
+        val directory = Files.createTempDirectory("jchatgpt-history-migration-test-")
+        val database = directory.resolve("chat-history.sqlite")
+        try {
+            Class.forName("org.sqlite.JDBC")
+            DriverManager.getConnection("jdbc:sqlite:${database.absolutePathString()}").use { connection ->
+                connection.createStatement().use { statement ->
+                    statement.executeUpdate(
+                        """
+                        CREATE TABLE message_record(
+                            id INTEGER PRIMARY KEY AUTOINCREMENT,
+                            bot_id INTEGER NOT NULL,
+                            from_id INTEGER NOT NULL,
+                            target_id INTEGER NOT NULL,
+                            ids TEXT,
+                            internal_ids TEXT,
+                            time INTEGER NOT NULL,
+                            kind INTEGER NOT NULL,
+                            code TEXT NOT NULL,
+                            recalled INTEGER NOT NULL DEFAULT 0
+                        )
+                        """.trimIndent()
+                    )
+                    statement.executeUpdate(
+                        "CREATE TABLE chat_history_meta(key TEXT PRIMARY KEY, value TEXT NOT NULL)"
+                    )
+                    statement.executeUpdate(
+                        "INSERT INTO chat_history_meta(key, value) VALUES ('schema_version', '2')"
+                    )
+                    statement.executeUpdate(
+                        """
+                        INSERT INTO message_record(
+                            bot_id, from_id, target_id, ids, internal_ids, time, kind, code, recalled
+                        ) VALUES (1, 11, 1000, '1', '1', 100, ${MessageSourceKind.GROUP.ordinal},
+                            '[{"type":"PlainText","content":"旧库部署失败"}]', 0)
+                        """.trimIndent()
+                    )
+                    statement.executeUpdate(
+                        """
+                        INSERT INTO message_record(
+                            bot_id, from_id, target_id, ids, internal_ids, time, kind, code, recalled
+                        ) VALUES (1, 12, 1000, '2', '2', 101, ${MessageSourceKind.GROUP.ordinal},
+                            '[{"type":"PlainText","content":"旧库部署失败后已恢复"}]', 0)
+                        """.trimIndent()
+                    )
+                }
+            }
+
+            ChatHistoryStore.init(directory.toFile())
+            assertTrue(ChatHistoryStore.isSearchIndexAvailable)
+            assertFalse(ChatHistoryStore.isSearchIndexReady)
+            var continueChecks = 0
+            assertEquals(
+                1,
+                ChatHistoryStore.backfillSearchIndex(
+                    batchSize = 1,
+                    shouldContinue = { continueChecks++ == 0 },
+                )
+            )
+            assertFalse(ChatHistoryStore.isSearchIndexReady)
+            ChatHistoryStore.close()
+
+            ChatHistoryStore.init(directory.toFile())
+            assertFalse(ChatHistoryStore.isSearchIndexReady)
+            assertEquals(1, ChatHistoryStore.backfillSearchIndex(batchSize = 1))
+            assertTrue(ChatHistoryStore.isSearchIndexReady)
+
+            val migratedSearch = ChatHistoryStore.search(
+                ChatHistorySearchRequest(
+                    subject = ChatHistorySubject(1, MessageSourceKind.GROUP, 1000),
+                    query = "旧库部署失败",
+                    matchMode = PHRASE,
+                    start = 0,
+                    end = 200,
+                )
+            )
+            assertEquals(2L, migratedSearch.totalMatches)
+            assertEquals(listOf(2L, 1L), migratedSearch.records.map { it.id })
+
+            DriverManager.getConnection("jdbc:sqlite:${database.absolutePathString()}").use { connection ->
+                connection.createStatement().use { statement ->
+                    statement.executeQuery("SELECT COUNT(*) FROM message_record").use { results ->
+                        assertTrue(results.next())
+                        assertEquals(2, results.getInt(1))
+                    }
+                    statement.executeQuery(
+                        "SELECT search_text FROM message_record_search WHERE message_id = 1"
+                    ).use { results ->
+                        assertTrue(results.next())
+                        assertEquals("旧库部署失败", results.getString(1))
+                    }
+                }
+            }
+        } finally {
+            ChatHistoryStore.close()
+            directory.toFile().deleteRecursively()
+        }
+    }
+
+    private fun insert(
+        directory: java.nio.file.Path,
+        time: Int,
+        fromId: Long,
+        text: String,
+        senderName: String = "",
+    ): Long {
+        val record = ChatMessageRecord(
+            botId = 1,
+            fromId = fromId,
+            targetId = 1000,
+            ids = "$time",
+            internalIds = "$time",
+            time = time,
+            kind = MessageSourceKind.GROUP,
+            code = buildJsonArray {
+                add(buildJsonObject {
+                    put("type", "PlainText")
+                    put("content", text)
+                })
+            }.toString(),
+        )
+        ChatHistoryStore.insertRecord(record, senderName)
+        DriverManager.getConnection("jdbc:sqlite:${directory.resolve("chat-history.sqlite").absolutePathString()}").use {
+            it.prepareStatement("SELECT id FROM message_record WHERE time = ? AND from_id = ?").use { query ->
+                query.setInt(1, time)
+                query.setLong(2, fromId)
+                query.executeQuery().use { results ->
+                    assertTrue(results.next())
+                    return results.getLong(1)
+                }
+            }
+        }
+    }
 }