feat: 平台配置全面生效 — 配置策略接入实际逻辑

- query组: ExecuteQuery读取query_limit_max/query_timeout/query_dangerous_pattern
  - 查询超时通过context.WithTimeout生效，db.QueryContext/QueryRowContext
  - 危险模式检测拦截无WHERE的DELETE/UPDATE/DROP/TRUNCATE
  - LIMIT上限从settings读取，不再硬编码1000

- security组: Login读取login_max_attempts/login_lockout_minutes
  - 新增User字段: failed_login_attempts + locked_until
  - 登录失败达到阈值自动锁定，成功时清除计数
  - JWT Token过期时间读取session_timeout_hours设置

- executor组: ExecuteTicket读取executor_timeout/executor_dry_run
  - 执行超时通过context.WithTimeout控制
  - 开启dry_run时先EXPLAIN预检查SQL语法
  - db.ExecContext替代db.Exec

- cleanup组: SettingsCleanupPreview/Run从占位改为真实实现
  - 预览统计4类数据(工单/查询历史/慢日志/审计日志)待清理数量
  - 执行清理按retention_days配置删除过期数据

- ghost组: 13项gh-ost配置加入seedDefaultSettings
  - enabled/path/mode/osc_priority/env/cloud/trigger/chunk/load/lag等
  - 已被ghost.go中getGhostConfig等函数读取

- 前端: PlatformConfigPage新增Ghost/OSC分组显示

backend/internal/handler/auth.go

@@ -29,6 +29,21 @@ func Login(c *gin.Context) {
 	var user model.User
 	err := model.DB.Where("username = ?", req.Username).First(&user).Error
 
+	// ── 登录失败锁定检查 ──
+	if err == nil && user.LockedUntil != nil && user.LockedUntil.After(time.Now()) {
+		maxAttempts := getSettingInt("login_max_attempts", 5)
+		lockMin := getSettingInt("login_lockout_minutes", 30)
+		remaining := int(user.LockedUntil.Sub(time.Now()).Minutes()) + 1
+		c.JSON(http.StatusTooManyRequests, gin.H{"detail": fmt.Sprintf("账号已锁定，连续 %d 次登录失败，请 %d 分钟后重试", maxAttempts, lockMin), "retry_after_minutes": remaining})
+		return
+	}
+	// Lock expired → reset
+	if err == nil && user.LockedUntil != nil && !user.LockedUntil.After(time.Now()) {
+		user.FailedLoginAttempts = 0
+		user.LockedUntil = nil
+		model.DB.Save(&user)
+	}
+
 	if err == nil {
 		// ── 本地用户存在 ──
 		if user.IsActive != nil && !*user.IsActive {
@@ -43,6 +58,8 @@ func Login(c *gin.Context) {
 			// Local password failed — try LDAP fallback for LDAP-imported users (password == "-")
 			_, ldapInfo, ldapErr := tryLDAPAuth(req.Username, req.Password)
 			if ldapErr != nil || ldapInfo == nil {
+				// Both local and LDAP failed → record failed attempt
+				handleFailedLogin(&user)
 				c.JSON(http.StatusUnauthorized, gin.H{"detail": "Invalid username or password"})
 				return
 			}
@@ -107,6 +124,9 @@ func Login(c *gin.Context) {
 	}
 
 	// ── 生成 Token ──
+	// Login success → reset failed attempts
+	user.FailedLoginAttempts = 0
+	user.LockedUntil = nil
 	token, err := middleware.GenerateToken(&user)
 	if err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"detail": "Failed to generate token"})
@@ -339,3 +359,16 @@ func DeleteUser(c *gin.Context) {
 	}
 	c.JSON(http.StatusOK, gin.H{"message": "User deleted"})
 }
+
+// handleFailedLogin records a failed login attempt and locks the account if threshold is reached.
+func handleFailedLogin(user *model.User) {
+	maxAttempts := getSettingInt("login_max_attempts", 5)
+	lockMinutes := getSettingInt("login_lockout_minutes", 30)
+
+	user.FailedLoginAttempts++
+	if user.FailedLoginAttempts >= maxAttempts {
+		lockedUntil := time.Now().Add(time.Duration(lockMinutes) * time.Minute)
+		user.LockedUntil = &lockedUntil
+	}
+	model.DB.Save(user)
+}

backend/internal/handler/connection_tester.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"database/sql"
 	"fmt"
+	"math"
 	"strconv"
 	"strings"
 	"time"
@@ -230,7 +231,7 @@ func getRedisMetrics(instance *model.Instance) map[string]interface{} {
 		return metrics
 	}
 	metrics["status"] = "online"
-	info, _ = rdb.Info(ctx, "server", "clients", "stats").Result()
+	info, _ = rdb.Info(ctx, "server", "clients", "stats", "memory", "cpu").Result()
 	// Latency from PING
 	start := time.Now()
 	rdb.Ping(ctx)
@@ -274,6 +275,48 @@ func getRedisMetrics(instance *model.Instance) map[string]interface{} {
 			metrics["uptime"] = fmt.Sprintf("%d 分钟", secs/60)
 		}
 	}
+	// Memory usage: used_memory / maxmemory * 100, fallback to total_system_memory
+	if used, ok := infoMap["used_memory"]; ok {
+		usedBytes, _ := strconv.ParseInt(used, 10, 64)
+		var memPercent int
+		if maxStr, ok2 := infoMap["maxmemory"]; ok2 {
+			maxBytes, _ := strconv.ParseInt(maxStr, 10, 64)
+			if maxBytes > 0 {
+				memPercent = int(usedBytes * 100 / maxBytes)
+			}
+		}
+		// Fallback: use total_system_memory if maxmemory not set (maxmemory=0)
+		if memPercent == 0 {
+			if totalStr, ok3 := infoMap["total_system_memory"]; ok3 {
+				totalBytes, _ := strconv.ParseInt(totalStr, 10, 64)
+				if totalBytes > 0 {
+					memPercent = int(usedBytes * 100 / totalBytes)
+				}
+			}
+		}
+		if memPercent > 0 {
+			metrics["memory"] = memPercent
+		}
+		metrics["used_memory_human"] = infoMap["used_memory_human"]
+	}
+	// CPU usage: (used_cpu_sys + used_cpu_user) / uptime_in_seconds * 100
+	if sys, ok := infoMap["used_cpu_sys"]; ok {
+		if user, ok2 := infoMap["used_cpu_user"]; ok2 {
+			sysVal, _ := strconv.ParseFloat(sys, 64)
+			userVal, _ := strconv.ParseFloat(user, 64)
+			total := sysVal + userVal
+			if upSecs, ok3 := infoMap["uptime_in_seconds"]; ok3 {
+				upVal, _ := strconv.ParseFloat(upSecs, 64)
+				if upVal > 0 {
+					pct := int(total / upVal * 100)
+					if pct > 100 {
+						pct = 100
+					}
+					metrics["cpu"] = pct
+				}
+			}
+		}
+	}
 
 	return metrics
 }
@@ -319,10 +362,12 @@ func getMySQLMetrics(instance *model.Instance) map[string]interface{} {
 	metrics["latency"] = time.Since(start).Milliseconds()
 	metrics["status"] = "online"
 
-	// Fetch STATUS variables
+	// Fetch STATUS + VARIABLES
 	statusVars := map[string]string{}
 	rows, err := db.QueryContext(ctx, "SHOW GLOBAL STATUS WHERE Variable_name IN "+
-		"('Threads_connected','Queries','Uptime','Connections','Slow_queries')")
+		"('Threads_connected','Threads_running','Queries','Uptime','Connections','Slow_queries',"+
+		"'Innodb_buffer_pool_pages_total','Innodb_buffer_pool_pages_data',"+
+		"'Innodb_buffer_pool_reads','Innodb_buffer_pool_read_requests')")
 	if err == nil {
 		defer rows.Close()
 		for rows.Next() {
@@ -331,10 +376,33 @@ func getMySQLMetrics(instance *model.Instance) map[string]interface{} {
 			statusVars[name] = value
 		}
 	}
+	varsMap := map[string]string{}
+	vrows, err := db.QueryContext(ctx, "SHOW VARIABLES WHERE Variable_name = 'max_connections'")
+	if err == nil {
+		defer vrows.Close()
+		for vrows.Next() {
+			var name, value string
+			vrows.Scan(&name, &value)
+			varsMap[name] = value
+		}
+	}
 
 	if v, ok := statusVars["Threads_connected"]; ok {
 		n, _ := strconv.Atoi(v)
 		metrics["connections"] = n
+		// Connection usage as cpu indicator
+		if maxStr, ok2 := varsMap["max_connections"]; ok2 {
+			maxConn, _ := strconv.Atoi(maxStr)
+			if maxConn > 0 {
+				metrics["cpu"] = int(math.Ceil(float64(n) * 100 / float64(maxConn)))
+				metrics["max_connections"] = maxConn
+			}
+		}
+	}
+	// Threads running (active)
+	if v, ok := statusVars["Threads_running"]; ok {
+		n, _ := strconv.Atoi(v)
+		metrics["threads_running"] = n
 	}
 	if v, ok := statusVars["Uptime"]; ok {
 		secs, _ := strconv.Atoi(v)
@@ -356,6 +424,27 @@ func getMySQLMetrics(instance *model.Instance) map[string]interface{} {
 			}
 		}
 	}
+	// Buffer pool usage as memory indicator
+	if bp, ok := statusVars["Innodb_buffer_pool_pages_total"]; ok {
+		if bd, ok2 := statusVars["Innodb_buffer_pool_pages_data"]; ok2 {
+			total, _ := strconv.ParseFloat(bp, 64)
+			used, _ := strconv.ParseFloat(bd, 64)
+			if total > 0 {
+				metrics["memory"] = int(used / total * 100)
+			}
+		}
+	}
+	// Slow queries count
+	if v, ok := statusVars["Slow_queries"]; ok {
+		n, _ := strconv.Atoi(v)
+		metrics["slow_queries"] = n
+	}
+	// Data size on disk
+	var dataMB float64
+	db.QueryRowContext(ctx, "SELECT COALESCE(ROUND(SUM(data_length + index_length)/1024/1024, 1), 0) FROM information_schema.tables WHERE table_schema NOT IN ('mysql','information_schema','performance_schema','sys')").Scan(&dataMB)
+	if dataMB > 0 {
+		metrics["data_size_mb"] = dataMB
+	}
 
 	// Version from DB if not already set
 	if instance.Version == nil || *instance.Version == "" {

backend/internal/handler/ghost.go

@@ -472,12 +472,70 @@ func UpdateSettings(c *gin.Context) {
 
 // GET /api/v1/settings/cleanup/preview
 func SettingsCleanupPreview(c *gin.Context) {
-	c.JSON(http.StatusOK, map[string]interface{}{})
+	now := time.Now()
+	stats := gin.H{}
+
+	// Tickets
+	ticketDays := getSettingInt("ticket_retention_days", 180)
+	var ticketCount int64
+	model.DB.Model(&model.Ticket{}).
+		Where("status IN ? AND create_time < ?", []string{"success", "failed", "closed", "rejected"}, now.AddDate(0, 0, -ticketDays)).
+		Count(&ticketCount)
+	stats["tickets"] = gin.H{"days": ticketDays, "count": ticketCount}
+
+	// Query history
+	queryDays := getSettingInt("query_history_retention_days", 90)
+	var queryCount int64
+	model.DB.Model(&model.QueryHistory{}).
+		Where("created_at < ?", now.AddDate(0, 0, -queryDays)).
+		Count(&queryCount)
+	stats["query_history"] = gin.H{"days": queryDays, "count": queryCount}
+
+	// Slow logs
+	slowDays := getSettingInt("slow_log_retention_days", 180)
+	var slowCount int64
+	model.DB.Model(&model.SlowLog{}).
+		Where("created_at < ?", now.AddDate(0, 0, -slowDays)).
+		Count(&slowCount)
+	stats["slow_logs"] = gin.H{"days": slowDays, "count": slowCount}
+
+	// Audit logs — skip if no AuditLog model; use raw SQL
+	auditDays := getSettingInt("audit_log_retention_days", 365)
+	var auditCount int64
+	model.DB.Raw("SELECT COUNT(*) FROM audit_logs WHERE created_at < ?", now.AddDate(0, 0, -auditDays)).Scan(&auditCount)
+	stats["audit_logs"] = gin.H{"days": auditDays, "count": auditCount}
+
+	c.JSON(http.StatusOK, stats)
 }
 
 // POST /api/v1/settings/cleanup/run
 func SettingsCleanupRun(c *gin.Context) {
-	c.JSON(http.StatusOK, gin.H{"message": "Cleanup done (placeholder)", "stats": map[string]interface{}{}})
+	now := time.Now()
+	stats := gin.H{}
+
+	// Tickets
+	ticketDays := getSettingInt("ticket_retention_days", 180)
+	ticketResult := model.DB.Where("status IN ? AND create_time < ?",
+		[]string{"success", "failed", "closed", "rejected"}, now.AddDate(0, 0, -ticketDays)).
+		Delete(&model.Ticket{})
+	stats["tickets_deleted"] = ticketResult.RowsAffected
+
+	// Query history
+	queryDays := getSettingInt("query_history_retention_days", 90)
+	queryResult := model.DB.Where("created_at < ?", now.AddDate(0, 0, -queryDays)).Delete(&model.QueryHistory{})
+	stats["query_history_deleted"] = queryResult.RowsAffected
+
+	// Slow logs
+	slowDays := getSettingInt("slow_log_retention_days", 180)
+	slowResult := model.DB.Where("created_at < ?", now.AddDate(0, 0, -slowDays)).Delete(&model.SlowLog{})
+	stats["slow_logs_deleted"] = slowResult.RowsAffected
+
+	// Audit logs
+	auditDays := getSettingInt("audit_log_retention_days", 365)
+	auditResult := model.DB.Exec("DELETE FROM audit_logs WHERE created_at < ?", now.AddDate(0, 0, -auditDays))
+	stats["audit_logs_deleted"] = auditResult.RowsAffected
+
+	c.JSON(http.StatusOK, gin.H{"message": "Cleanup completed", "stats": stats})
 }
 
 // GET /api/v1/notifications/channels

backend/internal/handler/instance.go

@@ -3,6 +3,7 @@ package handler
 import (
 	"net/http"
 	"strconv"
+	"strings"
 
 	"sql-platform/internal/middleware"
 	"sql-platform/internal/model"
@@ -66,6 +67,7 @@ func CreateInstance(c *gin.Context) {
 	}
 	// Encrypt password before storing
 	if instance.Password != "" {
+		instance.Password = strings.TrimSpace(instance.Password)
 		encPw, err := encryptPassword(instance.Password)
 		if err == nil {
 			instance.Password = "enc:" + encPw
@@ -75,15 +77,20 @@ func CreateInstance(c *gin.Context) {
 		c.JSON(http.StatusInternalServerError, gin.H{"detail": err.Error()})
 		return
 	}
-	// Auto-detect version and cluster_mode after creation
+	// Auto-detect version, cluster_mode and status after creation
 	go func() {
 		result := testDBConnectionFull(&instance)
 		updates := map[string]interface{}{}
-		if result.Success && result.Version != "" {
-			updates["version"] = result.Version
-		}
-		if result.ClusterMode {
-			updates["cluster_mode"] = true
+		if result.Success {
+			updates["status"] = "connected"
+			if result.Version != "" {
+				updates["version"] = result.Version
+			}
+			if result.ClusterMode {
+				updates["cluster_mode"] = true
+			}
+		} else {
+			updates["status"] = "error"
 		}
 		if len(updates) > 0 {
 			model.DB.Model(&model.Instance{}).Where("id = ?", instance.ID).Updates(updates)
@@ -110,6 +117,7 @@ func UpdateInstance(c *gin.Context) {
 	
 	// if password is empty or masked placeholder, don't update it
 	if pw, ok := input["password"].(string); ok {
+		pw = strings.TrimSpace(pw)
 		if pw == "" || pw == "******" {
 			delete(input, "password")
 		} else {

backend/internal/handler/instance_detail.go

@@ -521,16 +521,33 @@ func ExecuteQuery(c *gin.Context) {
 		c.JSON(http.StatusBadRequest, gin.H{"detail": "instance_id and sql are required"})
 		return
 	}
-	// Default pagination
+	// Read query limits from platform settings
+	maxLimit := getSettingInt("query_limit_max", 1000)
+	autoLimit := getSetting("query_auto_limit", "true") == "true"
 	if input.Limit <= 0 {
-		input.Limit = 100
+		input.Limit = maxLimit
+		if input.Limit > 1000 {
+			input.Limit = 1000
+		}
 	}
-	if input.Limit > 1000 {
-		input.Limit = 1000
+	if input.Limit > maxLimit {
+		input.Limit = maxLimit
 	}
 	if input.Offset < 0 {
 		input.Offset = 0
 	}
+	// Dangerous pattern check
+	if getSetting("query_dangerous_pattern", "true") == "true" {
+		upper := strings.ToUpper(input.SQL)
+		for _, pat := range []string{"DELETE FROM", "UPDATE ", "DROP ", "TRUNCATE", "ALTER ", "RENAME "} {
+			if strings.Contains(upper, pat) && !strings.Contains(upper, " WHERE ") && !strings.Contains(upper, " LIMIT ") {
+				c.JSON(http.StatusOK, gin.H{"columns": []string{}, "rows": []interface{}{}, "total": 0, "cost_ms": 0,
+					"error": "危险操作检测: " + pat + " 缺少 WHERE/LIMIT 条件，请在工单中提交"})
+				return
+			}
+		}
+	}
+	_ = autoLimit
 
 	var instance model.Instance
 	if err := model.DB.First(&instance, input.InstanceID).Error; err != nil {
@@ -595,6 +612,12 @@ func executeSQLQuery(instance *model.Instance, dbName string, sqlStr string, lim
 	}
 	defer db.Close()
 
+	// Apply query timeout from platform settings
+	timeoutSec := getSettingInt("query_timeout", 30)
+	ctx, cancel := context.WithTimeout(context.Background(), time.Duration(timeoutSec)*time.Second)
+	defer cancel()
+	_ = ctx
+
 	upperSQL := strings.ToUpper(strings.TrimSpace(sqlStr))
 
 	// Count total (only when no user LIMIT and offset=0)
@@ -613,7 +636,7 @@ func executeSQLQuery(instance *model.Instance, dbName string, sqlStr string, lim
 				if idx := strings.Index(upperCount, " GROUP BY "); idx > 0 {
 					countSQL = countSQL[:idx]
 				}
-				db.QueryRow(countSQL).Scan(&total)
+				db.QueryRowContext(ctx, countSQL).Scan(&total)
 			}
 		}
 	}
@@ -623,7 +646,7 @@ func executeSQLQuery(instance *model.Instance, dbName string, sqlStr string, lim
 		sqlStr = fmt.Sprintf("%s LIMIT %d OFFSET %d", sqlStr, limit, offset)
 	}
 
-	rows, err := db.Query(sqlStr)
+	rows, err := db.QueryContext(ctx, sqlStr)
 	if err != nil {
 		return nil, fmt.Errorf("query failed: %v", err)
 	}

backend/internal/handler/ticket.go

@@ -549,6 +549,39 @@ func ExecuteTicket(c *gin.Context) {
 			execErr = fmt.Sprintf("DB connection failed: %v", err)
 		} else {
 			defer db.Close()
+			// Apply executor timeout from platform settings
+			execTimeout := getSettingInt("executor_timeout", 300)
+			ctx, cancel := context.WithTimeout(context.Background(), time.Duration(execTimeout)*time.Second)
+			defer cancel()
+			// Dry-run: EXPLAIN pre-check
+			if getSetting("executor_dry_run", "true") == "true" {
+				statements := splitSQL(ticket.SQLContent)
+				for _, stmt := range statements {
+					stmt = strings.TrimSpace(stmt)
+					if stmt == "" || strings.HasPrefix(strings.ToUpper(stmt), "EXPLAIN") {
+						continue
+					}
+					var explainRows []string
+					rows, err := db.QueryContext(ctx, "EXPLAIN "+stmt)
+					if err != nil {
+						execErr = fmt.Sprintf("预检查失败(EXPLAIN): %v", err)
+						break
+					}
+					for rows.Next() {
+						rows.Close()
+						break
+					}
+					_ = explainRows
+				}
+				if execErr != "" {
+					failStatus := "failed"
+					ticket.Status = &failStatus
+					ticket.ExecuteResult = &execErr
+					model.DB.Save(&ticket)
+					c.JSON(http.StatusOK, gin.H{"message": "Pre-check failed", "ticket": ticket})
+					return
+				}
+			}
 			// Split multi-statement by semicolons
 			statements := splitSQL(ticket.SQLContent)
 			var results []string
@@ -557,7 +590,7 @@ func ExecuteTicket(c *gin.Context) {
 				if stmt == "" {
 					continue
 				}
-				_, err := db.Exec(stmt)
+				_, err := db.ExecContext(ctx, stmt)
 				if err != nil {
 					results = append(results, fmt.Sprintf("[FAIL] %s: %v", truncateStr(stmt, 50), err))
 					// stop_on_error