feat(api): add Grafana time range endpoint for scores

- Add /api/v2/server/scores/{server}/{mode} endpoint
- Support time range queries with from/to parameters
- Return data in Grafana table format for visualization
- Fix routing pattern to handle IP addresses correctly
- Add comprehensive parameter validation and error handling

chdb/logscores.go

@@ -3,6 +3,7 @@ package chdb
 import (
 	"context"
 	"fmt"
+	"strings"
 	"time"
 
 	"github.com/ClickHouse/clickhouse-go/v2"
@@ -105,3 +106,127 @@ func (d *ClickHouse) Logscores(ctx context.Context, serverID, monitorID int, sin
 
 	return rv, nil
 }
+
+// LogscoresTimeRange queries log scores within a specific time range for Grafana integration
+func (d *ClickHouse) LogscoresTimeRange(ctx context.Context, serverID, monitorID int, from, to time.Time, limit int) ([]ntpdb.LogScore, error) {
+	log := logger.Setup()
+	ctx, span := tracing.Tracer().Start(ctx, "CH LogscoresTimeRange")
+	defer span.End()
+
+	args := []interface{}{serverID, from, to}
+	
+	query := `select id,monitor_id,server_id,ts,
+                toFloat64(score),toFloat64(step),offset,
+                rtt,leap,warning,error
+              from log_scores
+              where
+                server_id = ?
+                and ts >= ?
+                and ts <= ?`
+
+	if monitorID > 0 {
+		query += " and monitor_id = ?"
+		args = append(args, monitorID)
+	}
+
+	// Always order by timestamp ASC for Grafana convention
+	query += " order by ts ASC"
+	
+	// Apply limit to prevent memory issues
+	if limit > 0 {
+		query += " limit ?"
+		args = append(args, limit)
+	}
+
+	log.DebugContext(ctx, "clickhouse time range query", 
+		"query", query, 
+		"args", args,
+		"server_id", serverID,
+		"monitor_id", monitorID,
+		"from", from.Format(time.RFC3339),
+		"to", to.Format(time.RFC3339),
+		"limit", limit,
+		"full_sql_with_params", func() string {
+			// Build a readable SQL query with parameters substituted for debugging
+			sqlDebug := query
+			paramIndex := 0
+			for strings.Contains(sqlDebug, "?") && paramIndex < len(args) {
+				var replacement string
+				switch v := args[paramIndex].(type) {
+				case int:
+					replacement = fmt.Sprintf("%d", v)
+				case time.Time:
+					replacement = fmt.Sprintf("'%s'", v.Format("2006-01-02 15:04:05"))
+				default:
+					replacement = fmt.Sprintf("'%v'", v)
+				}
+				sqlDebug = strings.Replace(sqlDebug, "?", replacement, 1)
+				paramIndex++
+			}
+			return sqlDebug
+		}(),
+	)
+
+	rows, err := d.Scores.Query(
+		clickhouse.Context(
+			ctx, clickhouse.WithSpan(span.SpanContext()),
+		),
+		query, args...,
+	)
+	if err != nil {
+		log.ErrorContext(ctx, "time range query error", "err", err)
+		return nil, fmt.Errorf("database error")
+	}
+
+	rv := []ntpdb.LogScore{}
+
+	for rows.Next() {
+		row := ntpdb.LogScore{}
+		var leap uint8
+
+		if err := rows.Scan(
+			&row.ID,
+			&row.MonitorID,
+			&row.ServerID,
+			&row.Ts,
+			&row.Score,
+			&row.Step,
+			&row.Offset,
+			&row.Rtt,
+			&leap,
+			&row.Attributes.Warning,
+			&row.Attributes.Error,
+		); err != nil {
+			log.Error("could not parse row", "err", err)
+			continue
+		}
+
+		row.Attributes.Leap = int8(leap)
+		rv = append(rv, row)
+	}
+
+	log.InfoContext(ctx, "time range query results", 
+		"rows_returned", len(rv),
+		"server_id", serverID,
+		"monitor_id", monitorID,
+		"time_range", fmt.Sprintf("%s to %s", from.Format(time.RFC3339), to.Format(time.RFC3339)),
+		"limit", limit,
+		"sample_rows", func() []map[string]interface{} {
+			samples := make([]map[string]interface{}, 0, 3)
+			for i, row := range rv {
+				if i >= 3 { break }
+				samples = append(samples, map[string]interface{}{
+					"id": row.ID,
+					"monitor_id": row.MonitorID,
+					"ts": row.Ts.Format(time.RFC3339),
+					"score": row.Score,
+					"rtt_valid": row.Rtt.Valid,
+					"offset_valid": row.Offset.Valid,
+				})
+			}
+			return samples
+		}(),
+	)
+
+	return rv, nil
+}

plans/grafana-time-range-api.md

@@ -1,20 +1,20 @@
 # DETAILED IMPLEMENTATION PLAN: Grafana Time Range API with Future Downsampling Support
 
 ## Overview
-Implement a new Grafana-compatible API endpoint `/api/v2/server/scores/{server}.{mode}` that returns time series data in Grafana format with time range support and future downsampling capabilities.
+Implement a new Grafana-compatible API endpoint `/api/v2/server/scores/{server}/{mode}` that returns time series data in Grafana format with time range support and future downsampling capabilities.
 
 ## API Specification
 
 ### Endpoint
-- **URL**: `/api/v2/server/scores/{server}.{mode}`
+- **URL**: `/api/v2/server/scores/{server}/{mode}`
 - **Method**: GET
 - **Path Parameters**:
   - `server`: Server IP address or ID (same validation as existing API)
   - `mode`: Only `json` supported initially
 
 ### Query Parameters (following Grafana conventions)
-- `from`: Unix timestamp in milliseconds (required)
-- `to`: Unix timestamp in milliseconds (required) 
+- `from`: Unix timestamp in seconds (required)
+- `to`: Unix timestamp in seconds (required) 
 - `maxDataPoints`: Integer, default 50000, max 50000 (for future downsampling)
 - `monitor`: Monitor ID, name prefix, or "*" for all (optional, same as existing)
 - `interval`: Future downsampling interval like "1m", "5m", "1h" (optional, not implemented initially)
@@ -52,9 +52,11 @@ Grafana table format JSON array (more efficient than separate series):
 ### 1. Server Routing (`server/server.go`)
 Add new route after existing scores routes:
 ```go
-e.GET("/api/v2/server/scores/:server.:mode", srv.scoresTimeRange)
+e.GET("/api/v2/server/scores/:server/:mode", srv.scoresTimeRange)
 ```
 
+**Note**: Initially attempted `:server.:mode` pattern, but Echo router cannot properly parse IP addresses with dots using this pattern. Changed to `:server/:mode` to match existing API pattern and ensure compatibility with IP addresses like `23.155.40.38`.
+
 ## Key Implementation Clarifications
 
 ### Monitor Filtering Behavior
@@ -73,7 +75,7 @@ e.GET("/api/v2/server/scores/:server.:mode", srv.scoresTimeRange)
 - **Minimum range**: 1 second
 - **Maximum range**: 90 days
 
-### 2. New Handler Function (`server/history.go`)
+### 2. New Handler Function (`server/grafana.go`)
 
 #### Function Signature
 ```go
@@ -98,7 +100,7 @@ func (srv *Server) parseTimeRangeParams(ctx context.Context, c echo.Context) (ti
         return timeRangeParams{}, err
     }
     
-    // Parse and validate from/to millisecond timestamps
+    // Parse and validate from/to second timestamps
     // Validate time range (max 90 days, min 1 second)
     // Parse maxDataPoints (default 50000, max 50000)
     // Return extended parameters
@@ -159,7 +161,7 @@ ORDER BY ts ASC
 LIMIT ?
 ```
 
-### 4. Data Transformation Logic (`server/history.go`)
+### 4. Data Transformation Logic (`server/grafana.go`)
 
 #### Core Transformation Function
 ```go
@@ -260,7 +262,7 @@ timestampMs := logScore.Ts.Unix() * 1000
 ```markdown
 ### 7. Server Scores Time Range (v2)
 
-**GET** `/api/v2/server/scores/{server}.{mode}`
+**GET** `/api/v2/server/scores/{server}/{mode}`
 
 Grafana-compatible time series endpoint for NTP server scoring data.
 
@@ -269,8 +271,8 @@ Grafana-compatible time series endpoint for NTP server scoring data.
 - `mode`: Response format (`json` only)
 
 #### Query Parameters  
-- `from`: Start time as Unix timestamp in milliseconds (required)
-- `to`: End time as Unix timestamp in milliseconds (required)
+- `from`: Start time as Unix timestamp in seconds (required)
+- `to`: End time as Unix timestamp in seconds (required)
 - `maxDataPoints`: Maximum data points to return (default: 50000, max: 50000)
 - `monitor`: Monitor filter (ID, name prefix, or "*" for all)
 
@@ -319,14 +321,51 @@ Grafana table format array with one series per monitor containing all metrics as
 
 **Recommended Grafana Data Source**: JSON API plugin (`marcusolsson-json-datasource`) - ideal for REST APIs returning table format JSON
 
-### Phase 1: Core Implementation
-- [ ] Add route in server.go
-- [ ] Implement parseTimeRangeParams function
-- [ ] Add LogscoresTimeRange method to ClickHouse
-- [ ] Implement transformToGrafanaTableFormat function
-- [ ] Add scoresTimeRange handler
-- [ ] Error handling and validation (reuse existing Echo patterns)
-- [ ] Cache control headers (reuse setHistoryCacheControl)
+### Phase 1: Core Implementation ✅ **COMPLETED**
+- [x] Add route in server.go (fixed routing pattern from `:server.:mode` to `:server/:mode`)
+- [x] Implement parseTimeRangeParams function for parameter validation
+- [x] Add LogscoresTimeRange method to ClickHouse with time range filtering
+- [x] Implement transformToGrafanaTableFormat function with monitor grouping
+- [x] Add scoresTimeRange handler with full error handling
+- [x] Error handling and validation (reuse existing Echo patterns)
+- [x] Cache control headers (reuse setHistoryCacheControl)
+
+#### Phase 1 Implementation Details
+**Key Components Built:**
+- **Route Pattern**: `/api/v2/server/scores/:server/:mode` (matches existing API consistency)
+- **Parameter Validation**: Full validation of `from`/`to` timestamps, `maxDataPoints`, time ranges
+- **ClickHouse Integration**: `LogscoresTimeRange()` with time-based WHERE clauses and ASC ordering
+- **Data Transformation**: Grafana table format with monitor grouping and null value handling
+- **Complete Handler**: `scoresTimeRange()` with server validation, error handling, caching, and CORS
+
+**Routing Fix**: Changed from `:server.:mode` to `:server/:mode` to resolve Echo router issue with IP addresses containing dots (e.g., `23.155.40.38`).
+
+**Files Created/Modified in Phase 1:**
+- `server/grafana.go`: Complete implementation with all structures and functions
+  - `timeRangeParams` struct and `parseTimeRangeParams()` function
+  - `transformToGrafanaTableFormat()` function with monitor grouping
+  - `scoresTimeRange()` handler with full error handling
+  - `sanitizeMonitorName()` utility function
+- `server/server.go`: Added route `e.GET("/api/v2/server/scores/:server/:mode", srv.scoresTimeRange)`
+- `chdb/logscores.go`: Added `LogscoresTimeRange()` method for time-based queries
+
+**Production Testing Results** (July 25, 2025):
+- ✅ **Real Data Verification**: Successfully tested with server `102.64.112.164` over 12-hour time range
+- ✅ **Multiple Monitor Support**: Returns data for multiple monitors (`defra1-210hw9t`, `recentmedian`)
+- ✅ **Data Quality Validation**: 
+  - RTT conversion (microseconds → milliseconds): ✅ Working
+  - Timestamp conversion (seconds → milliseconds): ✅ Working  
+  - Null value handling: ✅ Working (recentmedian has null RTT/offset as expected)
+  - Monitor grouping: ✅ Working (one series per monitor)
+- ✅ **API Parameter Changes**: Successfully changed from milliseconds to seconds for user-friendliness
+- ✅ **Volume Testing**: Handles 100+ data points per monitor efficiently
+- ✅ **Error Handling**: All validation working (400 for invalid params, 404 for missing servers)
+- ✅ **Performance**: Sub-second response times for 12-hour ranges
+
+**Sample Working Request:**
+```bash
+curl 'http://localhost:8030/api/v2/server/scores/102.64.112.164/json?from=1753457764&to=1753500964&monitor=*'
+```
 
 ### Phase 2: Testing & Polish
 - [ ] Unit tests for all functions

server/grafana.go

@@ -1,12 +1,17 @@
 package server
 
 import (
+	"context"
 	"net/http"
+	"strconv"
+	"strings"
 	"time"
 
 	"github.com/labstack/echo/v4"
 	"go.ntppool.org/common/logger"
 	"go.ntppool.org/common/tracing"
+	"go.ntppool.org/data-api/logscores"
+	"go.ntppool.org/data-api/ntpdb"
 )
 
 // ColumnDef represents a Grafana table column definition
@@ -27,6 +32,434 @@ type GrafanaTableSeries struct {
 // GrafanaTimeSeriesResponse represents the complete Grafana table response
 type GrafanaTimeSeriesResponse []GrafanaTableSeries
 
+// timeRangeParams extends historyParameters with time range support
+type timeRangeParams struct {
+	historyParameters // embed existing struct
+	from              time.Time
+	to                time.Time
+	maxDataPoints     int
+	interval          string // for future downsampling
+}
+
+// parseTimeRangeParams parses and validates time range parameters
+func (srv *Server) parseTimeRangeParams(ctx context.Context, c echo.Context) (timeRangeParams, error) {
+	log := logger.FromContext(ctx)
+	
+	// Start with existing parameter parsing logic
+	baseParams, err := srv.getHistoryParameters(ctx, c)
+	if err != nil {
+		return timeRangeParams{}, err
+	}
+	
+	trParams := timeRangeParams{
+		historyParameters: baseParams,
+		maxDataPoints:     50000, // default
+	}
+	
+	// Parse from timestamp (required)
+	fromParam := c.QueryParam("from")
+	if fromParam == "" {
+		return timeRangeParams{}, echo.NewHTTPError(http.StatusBadRequest, "from parameter is required")
+	}
+	
+	fromSec, err := strconv.ParseInt(fromParam, 10, 64)
+	if err != nil {
+		return timeRangeParams{}, echo.NewHTTPError(http.StatusBadRequest, "invalid from timestamp format")
+	}
+	trParams.from = time.Unix(fromSec, 0)
+	
+	// Parse to timestamp (required)
+	toParam := c.QueryParam("to")
+	if toParam == "" {
+		return timeRangeParams{}, echo.NewHTTPError(http.StatusBadRequest, "to parameter is required")
+	}
+	
+	toSec, err := strconv.ParseInt(toParam, 10, 64)
+	if err != nil {
+		return timeRangeParams{}, echo.NewHTTPError(http.StatusBadRequest, "invalid to timestamp format")
+	}
+	trParams.to = time.Unix(toSec, 0)
+	
+	// Validate time range
+	if trParams.from.Equal(trParams.to) || trParams.from.After(trParams.to) {
+		return timeRangeParams{}, echo.NewHTTPError(http.StatusBadRequest, "from must be before to")
+	}
+	
+	// Check minimum range (1 second)
+	if trParams.to.Sub(trParams.from) < time.Second {
+		return timeRangeParams{}, echo.NewHTTPError(http.StatusBadRequest, "time range must be at least 1 second")
+	}
+	
+	// Check maximum range (90 days)
+	if trParams.to.Sub(trParams.from) > 90*24*time.Hour {
+		return timeRangeParams{}, echo.NewHTTPError(http.StatusBadRequest, "time range cannot exceed 90 days")
+	}
+	
+	// Parse maxDataPoints (optional)
+	if maxDataPointsParam := c.QueryParam("maxDataPoints"); maxDataPointsParam != "" {
+		maxDP, err := strconv.Atoi(maxDataPointsParam)
+		if err != nil {
+			return timeRangeParams{}, echo.NewHTTPError(http.StatusBadRequest, "invalid maxDataPoints format")
+		}
+		if maxDP > 50000 {
+			return timeRangeParams{}, echo.NewHTTPError(http.StatusBadRequest, "maxDataPoints cannot exceed 50000")
+		}
+		if maxDP > 0 {
+			trParams.maxDataPoints = maxDP
+		}
+	}
+	
+	// Parse interval (optional, for future downsampling)
+	trParams.interval = c.QueryParam("interval")
+	
+	log.DebugContext(ctx, "parsed time range params",
+		"from", trParams.from,
+		"to", trParams.to,
+		"maxDataPoints", trParams.maxDataPoints,
+		"interval", trParams.interval,
+		"monitor", trParams.monitorID,
+	)
+	
+	return trParams, nil
+}
+
+// sanitizeMonitorName sanitizes monitor names for Grafana target format
+func sanitizeMonitorName(name string) string {
+	// Replace problematic characters for Grafana target format
+	result := strings.ReplaceAll(name, " ", "_")
+	result = strings.ReplaceAll(result, ".", "-")
+	result = strings.ReplaceAll(result, "/", "-")
+	return result
+}
+
+// transformToGrafanaTableFormat converts LogScoreHistory to Grafana table format
+func transformToGrafanaTableFormat(history *logscores.LogScoreHistory, monitors []ntpdb.Monitor) GrafanaTimeSeriesResponse {
+	// Group data by monitor_id (one series per monitor)
+	monitorData := make(map[int][]ntpdb.LogScore)
+	monitorInfo := make(map[int]ntpdb.Monitor)
+	
+	// Group log scores by monitor ID
+	skippedInvalidMonitors := 0
+	for _, ls := range history.LogScores {
+		if !ls.MonitorID.Valid {
+			skippedInvalidMonitors++
+			continue
+		}
+		monitorID := int(ls.MonitorID.Int32)
+		monitorData[monitorID] = append(monitorData[monitorID], ls)
+	}
+	
+	// Debug logging for transformation
+	logger.Setup().Info("transformation grouping debug",
+		"total_log_scores", len(history.LogScores),
+		"skipped_invalid_monitors", skippedInvalidMonitors,
+		"grouped_monitor_ids", func() []int {
+			keys := make([]int, 0, len(monitorData))
+			for k := range monitorData {
+				keys = append(keys, k)
+			}
+			return keys
+		}(),
+		"monitor_data_counts", func() map[int]int {
+			counts := make(map[int]int)
+			for k, v := range monitorData {
+				counts[k] = len(v)
+			}
+			return counts
+		}(),
+	)
+	
+	// Index monitors by ID for quick lookup
+	for _, monitor := range monitors {
+		monitorInfo[int(monitor.ID)] = monitor
+	}
+	
+	var response GrafanaTimeSeriesResponse
+	
+	// Create one table series per monitor
+	logger.Setup().Info("creating grafana series", 
+		"monitor_data_entries", len(monitorData),
+	)
+	
+	for monitorID, logScores := range monitorData {
+		if len(logScores) == 0 {
+			logger.Setup().Info("skipping monitor with no data", "monitor_id", monitorID)
+			continue
+		}
+		
+		logger.Setup().Info("processing monitor series", 
+			"monitor_id", monitorID,
+			"log_scores_count", len(logScores),
+		)
+		
+		// Get monitor name from history.Monitors map or from monitor info
+		monitorName := "unknown"
+		if name, exists := history.Monitors[monitorID]; exists && name != "" {
+			monitorName = name
+		} else if monitor, exists := monitorInfo[monitorID]; exists {
+			monitorName = monitor.DisplayName()
+		}
+		
+		// Build target name and tags
+		sanitizedName := sanitizeMonitorName(monitorName)
+		target := "monitor{name=" + sanitizedName + "}"
+		
+		tags := map[string]string{
+			"monitor_id":   strconv.Itoa(monitorID),
+			"monitor_name": monitorName,
+			"type":         "monitor",
+		}
+		
+		// Add status (we'll use active as default since we have data for this monitor)
+		tags["status"] = "active"
+		
+		// Define table columns
+		columns := []ColumnDef{
+			{Text: "time", Type: "time"},
+			{Text: "score", Type: "number"},
+			{Text: "rtt", Type: "number", Unit: "ms"},
+			{Text: "offset", Type: "number", Unit: "s"},
+		}
+		
+		// Build values array
+		var values [][]interface{}
+		for _, ls := range logScores {
+			// Convert timestamp to milliseconds
+			timestampMs := ls.Ts.Unix() * 1000
+			
+			// Create row: [time, score, rtt, offset]
+			row := []interface{}{
+				timestampMs,
+				ls.Score,
+			}
+			
+			// Add RTT (convert from microseconds to milliseconds, handle null)
+			if ls.Rtt.Valid {
+				rttMs := float64(ls.Rtt.Int32) / 1000.0
+				row = append(row, rttMs)
+			} else {
+				row = append(row, nil)
+			}
+			
+			// Add offset (handle null)
+			if ls.Offset.Valid {
+				row = append(row, ls.Offset.Float64)
+			} else {
+				row = append(row, nil)
+			}
+			
+			values = append(values, row)
+		}
+		
+		// Create table series
+		series := GrafanaTableSeries{
+			Target:  target,
+			Tags:    tags,
+			Columns: columns,
+			Values:  values,
+		}
+		
+		response = append(response, series)
+		
+		logger.Setup().Info("created series for monitor", 
+			"monitor_id", monitorID,
+			"target", series.Target,
+			"values_count", len(series.Values),
+		)
+	}
+	
+	logger.Setup().Info("transformation complete", 
+		"final_response_count", len(response),
+		"response_is_nil", response == nil,
+	)
+	
+	return response
+}
+
+// scoresTimeRange handles Grafana time range requests for NTP server scores
+func (srv *Server) scoresTimeRange(c echo.Context) error {
+	log := logger.Setup()
+	ctx, span := tracing.Tracer().Start(c.Request().Context(), "scoresTimeRange")
+	defer span.End()
+
+	// Set reasonable default cache time; adjusted later based on data
+	c.Response().Header().Set("Cache-Control", "public,max-age=240")
+
+	// Validate mode parameter
+	mode := c.Param("mode")
+	if mode != "json" {
+		return echo.NewHTTPError(http.StatusNotFound, "invalid mode - only json supported")
+	}
+
+	// Parse and validate time range parameters
+	params, err := srv.parseTimeRangeParams(ctx, c)
+	if err != nil {
+		if he, ok := err.(*echo.HTTPError); ok {
+			return he
+		}
+		log.ErrorContext(ctx, "parse time range parameters", "err", err)
+		span.RecordError(err)
+		return echo.NewHTTPError(http.StatusInternalServerError, "internal error")
+	}
+
+	// Find and validate server
+	server, err := srv.FindServer(ctx, c.Param("server"))
+	if err != nil {
+		log.ErrorContext(ctx, "find server", "err", err)
+		if he, ok := err.(*echo.HTTPError); ok {
+			return he
+		}
+		span.RecordError(err)
+		return echo.NewHTTPError(http.StatusInternalServerError, "internal error")
+	}
+	if server.DeletionAge(30 * 24 * time.Hour) {
+		span.AddEvent("server deleted")
+		return echo.NewHTTPError(http.StatusNotFound, "server not found")
+	}
+	if server.ID == 0 {
+		span.AddEvent("server not found")
+		return echo.NewHTTPError(http.StatusNotFound, "server not found")
+	}
+
+	// Query ClickHouse for time range data
+	log.InfoContext(ctx, "executing clickhouse time range query",
+		"server_id", server.ID,
+		"server_ip", server.Ip,
+		"monitor_id", params.monitorID,
+		"from", params.from,
+		"to", params.to,
+		"max_data_points", params.maxDataPoints,
+		"time_range_duration", params.to.Sub(params.from).String(),
+	)
+	
+	logScores, err := srv.ch.LogscoresTimeRange(ctx, int(server.ID), params.monitorID, params.from, params.to, params.maxDataPoints)
+	if err != nil {
+		log.ErrorContext(ctx, "clickhouse time range query", "err", err, 
+			"server_id", server.ID,
+			"monitor_id", params.monitorID,
+			"from", params.from,
+			"to", params.to,
+		)
+		span.RecordError(err)
+		return echo.NewHTTPError(http.StatusInternalServerError, "internal error")
+	}
+	
+	log.InfoContext(ctx, "clickhouse query results",
+		"server_id", server.ID,
+		"rows_returned", len(logScores),
+		"first_few_ids", func() []uint64 {
+			ids := make([]uint64, 0, 3)
+			for i, ls := range logScores {
+				if i >= 3 { break }
+				ids = append(ids, ls.ID)
+			}
+			return ids
+		}(),
+	)
+
+	// Build LogScoreHistory structure for compatibility with existing functions
+	history := &logscores.LogScoreHistory{
+		LogScores: logScores,
+		Monitors:  make(map[int]string),
+	}
+
+	// Get monitor names for the returned data
+	monitorIDs := []uint32{}
+	for _, ls := range logScores {
+		if ls.MonitorID.Valid {
+			monitorID := uint32(ls.MonitorID.Int32)
+			if _, exists := history.Monitors[int(monitorID)]; !exists {
+				history.Monitors[int(monitorID)] = ""
+				monitorIDs = append(monitorIDs, monitorID)
+			}
+		}
+	}
+	
+	log.InfoContext(ctx, "monitor processing",
+		"unique_monitor_ids", monitorIDs,
+		"monitor_count", len(monitorIDs),
+	)
+
+	// Get monitor details from database for status and display names
+	var monitors []ntpdb.Monitor
+	if len(monitorIDs) > 0 {
+		q := ntpdb.NewWrappedQuerier(ntpdb.New(srv.db))
+		logScoreMonitors, err := q.GetServerScores(ctx, ntpdb.GetServerScoresParams{
+			MonitorIDs: monitorIDs,
+			ServerID:   server.ID,
+		})
+		if err != nil {
+			log.ErrorContext(ctx, "get monitor details", "err", err)
+			// Don't fail the request, just use basic info
+		} else {
+			for _, lsm := range logScoreMonitors {
+				// Create monitor entry for transformation (we mainly need the display name)
+				tempMon := ntpdb.Monitor{
+					TlsName:  lsm.TlsName,
+					Location: lsm.Location,
+					ID:       lsm.ID,
+				}
+				monitors = append(monitors, tempMon)
+				
+				// Update monitor name in history
+				history.Monitors[int(lsm.ID)] = tempMon.DisplayName()
+			}
+		}
+	}
+
+	// Transform to Grafana table format
+	log.InfoContext(ctx, "starting grafana transformation",
+		"log_scores_count", len(logScores),
+		"monitors_count", len(monitors),
+		"history_monitors", history.Monitors,
+	)
+	
+	grafanaResponse := transformToGrafanaTableFormat(history, monitors)
+	
+	log.InfoContext(ctx, "grafana transformation complete",
+		"response_series_count", len(grafanaResponse),
+		"response_preview", func() interface{} {
+			if len(grafanaResponse) == 0 {
+				return "empty_response"
+			}
+			first := grafanaResponse[0]
+			return map[string]interface{}{
+				"target": first.Target,
+				"tags": first.Tags,
+				"columns_count": len(first.Columns),
+				"values_count": len(first.Values),
+				"first_few_values": func() [][]interface{} {
+					if len(first.Values) == 0 { return [][]interface{}{} }
+					count := 2
+					if len(first.Values) < count { count = len(first.Values) }
+					return first.Values[:count]
+				}(),
+			}
+		}(),
+	)
+
+	// Set cache control headers based on data characteristics
+	setHistoryCacheControl(c, history)
+
+	// Set CORS headers
+	c.Response().Header().Set("Access-Control-Allow-Origin", "*")
+	c.Response().Header().Set("Content-Type", "application/json")
+
+	log.InfoContext(ctx, "time range response final", 
+		"server_id", server.ID,
+		"server_ip", server.Ip,
+		"monitor_id", params.monitorID,
+		"time_range", params.to.Sub(params.from).String(),
+		"raw_data_points", len(logScores),
+		"grafana_series_count", len(grafanaResponse),
+		"max_data_points", params.maxDataPoints,
+		"response_is_null", grafanaResponse == nil,
+		"response_is_empty", len(grafanaResponse) == 0,
+	)
+
+	return c.JSON(http.StatusOK, grafanaResponse)
+}
+
 // testGrafanaTable returns sample data in Grafana table format for validation
 func (srv *Server) testGrafanaTable(c echo.Context) error {
 	log := logger.Setup()

server/history.go

@@ -456,3 +456,4 @@ func setHistoryCacheControl(c echo.Context, history *logscores.LogScoreHistory)
 		}
 	}
 }
+

server/server.go

@@ -209,6 +209,7 @@ func (srv *Server) Run() error {
 	e.GET("/api/server/scores/:server/:mode", srv.history)
 	e.GET("/api/dns/counts", srv.dnsQueryCounts)
 	e.GET("/api/v2/test/grafana-table", srv.testGrafanaTable)
+	e.GET("/api/v2/server/scores/:server/:mode", srv.scoresTimeRange)
 
 	if len(ntpconf.WebHostname()) > 0 {
 		e.POST("/api/server/scores/:server/:mode", func(c echo.Context) error {