refactor: separate log timestamp from message as structured LogEntry

Introduced models.LogEntry{Message, CreatedAt} to replace raw strings
in the log pipeline. Timestamps are now formatted at render time, not
baked into stored messages.

- Engine: appendLog stores LogEntry with time.Now()
- Store: LoadLogs returns []LogEntry, selects created_at from DB
- Store: strips legacy [HH:MM] prefix from pre-refactor DB entries
- TUI: sidebar shows "MM/DD HH:MM" from CreatedAt
- TUI: full log view shows "MM/DD HH:MM" from CreatedAt
- SaveLog still receives plain message string (DB handles timestamp)

internal/models/models.go

@@ -86,6 +86,11 @@ type ProbeNode struct {
 	Version  string
 }
 
+type LogEntry struct {
+	Message   string
+	CreatedAt time.Time
+}
+
 // AlertHealthRecord is the persisted send health of an alert channel. It lets the
 // "last sent" / health indicators survive restarts instead of resetting to "never".
 type AlertHealthRecord struct {

internal/monitor/monitor.go

@@ -40,7 +40,7 @@ type Engine struct {
 	liveState map[int]models.Site
 
 	logMu    sync.RWMutex
-	logStore []string
+	logStore []models.LogEntry
 
 	activeMu sync.RWMutex
 	isActive bool
@@ -152,11 +152,13 @@ func fmtDurationShort(d time.Duration) string {
 // appendLog adds a timestamped entry to the in-memory ring buffer and returns
 // it. It never touches the database, so it is safe to call from the db-write
 // drop/error path without recursing back through the write queue.
-func (e *Engine) appendLog(msg string) string {
+func (e *Engine) appendLog(msg string) models.LogEntry {
-	ts := time.Now().Format("15:04:05")
+	entry := models.LogEntry{
-	entry := fmt.Sprintf("[%s] %s", ts, sanitizeLog(msg))
+		Message:   sanitizeLog(msg),
+		CreatedAt: time.Now(),
+	}
 	e.logMu.Lock()
-	e.logStore = append([]string{entry}, e.logStore...)
+	e.logStore = append([]models.LogEntry{entry}, e.logStore...)
 	if len(e.logStore) > maxLogEntries {
 		e.logStore = e.logStore[:maxLogEntries]
 	}
@@ -166,7 +168,7 @@ func (e *Engine) appendLog(msg string) string {
 
 func (e *Engine) AddLog(msg string) {
 	entry := e.appendLog(msg)
-	e.enqueueWrite(writeLog{message: entry})
+	e.enqueueWrite(writeLog{message: entry.Message})
 }
 
 // enqueueWrite hands a persistence task to the writer goroutine without
@@ -246,16 +248,16 @@ func (e *Engine) Stop() {
 }
 
 func (e *Engine) InitLogs() {
-	logs, err := e.db.LoadLogs(context.Background(), maxLogEntries)
+	entries, err := e.db.LoadLogs(context.Background(), maxLogEntries)
 	if err != nil {
 		return
 	}
-	if len(logs) == 0 {
+	if len(entries) == 0 {
 		return
 	}
 	e.logMu.Lock()
 	defer e.logMu.Unlock()
-	e.logStore = logs
+	e.logStore = entries
 }
 
 // InitAlertHealth restores persisted alert send health so the dashboard shows real
@@ -278,10 +280,10 @@ func (e *Engine) InitAlertHealth() {
 	}
 }
 
-func (e *Engine) GetLogs() []string {
+func (e *Engine) GetLogs() []models.LogEntry {
 	e.logMu.RLock()
 	defer e.logMu.RUnlock()
-	logs := make([]string, len(e.logStore))
+	logs := make([]models.LogEntry, len(e.logStore))
 	copy(logs, e.logStore)
 	return logs
 }

internal/monitor/monitor_test.go

@@ -25,7 +25,7 @@ type mockStore struct {
 	sites         []models.SiteConfig
 	alerts        map[int]models.AlertConfig
 	maintenance   map[int]bool
-	logs          []string
+	logs          []models.LogEntry
 	history       map[int][]models.CheckRecord
 	savedChecks   []savedCheck
 	savedLogs     []string
@@ -103,7 +103,7 @@ func (m *mockStore) SaveLog(_ context.Context, msg string) error {
 	return nil
 }
 
-func (m *mockStore) LoadLogs(_ context.Context, _ int) ([]string, error) {
+func (m *mockStore) LoadLogs(_ context.Context, _ int) ([]models.LogEntry, error) {
 	return m.logs, nil
 }
 
@@ -330,7 +330,7 @@ func TestHandleStatusChange_AlertSuppressedMaintenance(t *testing.T) {
 	logs := e.GetLogs()
 	found := false
 	for _, l := range logs {
-		if containsStr(l, "suppressed") {
+		if containsStr(l.Message, "suppressed") {
 			found = true
 			break
 		}
@@ -973,14 +973,17 @@ func TestAddLog_PrependAndCap(t *testing.T) {
 	if len(logs) != 100 {
 		t.Errorf("expected 100 logs, got %d", len(logs))
 	}
-	if !containsStr(logs[0], "log-104") {
+	if !containsStr(logs[0].Message, "log-104") {
-		t.Errorf("expected newest log first, got %s", logs[0])
+		t.Errorf("expected newest log first, got %s", logs[0].Message)
 	}
 }
 
 func TestInitLogs_LoadsFromDB(t *testing.T) {
 	ms := newMockStore()
-	ms.logs = []string{"old-log-1", "old-log-2"}
+	ms.logs = []models.LogEntry{
+		{Message: "old-log-1"},
+		{Message: "old-log-2"},
+	}
 	e := newTestEngine(ms)
 	e.InitLogs()
 

internal/store/sqlstore.go

@@ -7,6 +7,7 @@ import (
 	"encoding/hex"
 	"encoding/json"
 	"fmt"
+	"strings"
 	"time"
 
 	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
@@ -554,21 +555,27 @@ func (s *SQLStore) PruneLogs(ctx context.Context) error {
 	return err
 }
 
-func (s *SQLStore) LoadLogs(ctx context.Context, limit int) ([]string, error) {
+func (s *SQLStore) LoadLogs(ctx context.Context, limit int) ([]models.LogEntry, error) {
-	rows, err := s.db.QueryContext(ctx, s.q("SELECT message FROM logs ORDER BY created_at DESC LIMIT ?"), limit)
+	rows, err := s.db.QueryContext(ctx, s.q("SELECT message, created_at FROM logs ORDER BY created_at DESC, id DESC LIMIT ?"), limit)
 	if err != nil {
 		return nil, err
 	}
 	defer rows.Close()
-	var logs []string
+	var entries []models.LogEntry
 	for rows.Next() {
-		var msg string
+		var e models.LogEntry
-		if err := rows.Scan(&msg); err != nil {
+		if err := rows.Scan(&e.Message, &e.CreatedAt); err != nil {
-			return logs, err
+			return entries, err
 		}
-		logs = append(logs, msg)
+		// Strip legacy [HH:MM] or [HH:MM:SS] prefix from pre-refactor entries.
+		if len(e.Message) > 3 && e.Message[0] == '[' {
+			if idx := strings.Index(e.Message, "]"); idx > 0 && idx < 12 {
+				e.Message = strings.TrimSpace(e.Message[idx+1:])
 			}
-	return logs, rows.Err()
+		}
+		entries = append(entries, e)
+	}
+	return entries, rows.Err()
 }
 
 func (s *SQLStore) LoadAllHistory(ctx context.Context, limit int) (map[int][]models.CheckRecord, error) {

internal/store/sqlstore_test.go

@@ -407,7 +407,7 @@ func TestPruneLogs(t *testing.T) {
 	// LoadLogs ordering ties when rows share a created_at second).
 	present := make(map[string]bool, len(logs))
 	for _, l := range logs {
-		present[l] = true
+		present[l.Message] = true
 	}
 	if !present[fmt.Sprintf("log %d", maxLogRows+50-1)] {
 		t.Error("newest log was pruned")

internal/store/store.go

@@ -61,7 +61,7 @@ type Store interface {
 
 	// Logs
 	SaveLog(ctx context.Context, message string) error
-	LoadLogs(ctx context.Context, limit int) ([]string, error)
+	LoadLogs(ctx context.Context, limit int) ([]models.LogEntry, error)
 	PruneLogs(ctx context.Context) error
 
 	// Maintenance Windows

internal/store/storetest/mock.go

@@ -212,7 +212,7 @@ func (m *BaseMock) SaveLog(ctx context.Context, message string) error {
 	return nil
 }
 
-func (m *BaseMock) LoadLogs(_ context.Context, _ int) ([]string, error) { return nil, nil }
+func (m *BaseMock) LoadLogs(_ context.Context, _ int) ([]models.LogEntry, error) { return nil, nil }
 func (m *BaseMock) PruneLogs(_ context.Context) error                            { return nil }
 
 func (m *BaseMock) GetActiveMaintenanceWindows(ctx context.Context) ([]models.MaintenanceWindow, error) {

internal/tui/tab_logs.go

@@ -3,6 +3,8 @@ package tui
 import (
 	"fmt"
 	"strings"
+
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
 )
 
 type logSeverity int
@@ -15,8 +17,8 @@ const (
 	severitySystem
 )
 
-func classifyLog(line string) logSeverity {
+func classifyLog(msg string) logSeverity {
-	lower := strings.ToLower(line)
+	lower := strings.ToLower(msg)
 	switch {
 	case strings.Contains(lower, "confirmed down"),
 		strings.Contains(lower, "is down"),
@@ -63,44 +65,29 @@ func (m Model) renderLogTag(sev logSeverity) string {
 	}
 }
 
-func (m Model) renderLogLine(line string) string {
+func (m Model) renderLogLine(entry models.LogEntry) string {
-	sev := classifyLog(line)
+	sev := classifyLog(entry.Message)
 	tag := m.renderLogTag(sev)
-
+	ts := m.st.subtleStyle.Render(entry.CreatedAt.Local().Format("01/02 15:04"))
-	ts := ""
+	return fmt.Sprintf("  %s  %s  %s", ts, tag, entry.Message)
-	msg := line
-	if len(line) > 10 && line[0] == '[' {
-		if idx := strings.Index(line, "]"); idx > 0 && idx < 12 {
-			ts = m.st.subtleStyle.Render(line[1:idx])
-			msg = strings.TrimSpace(line[idx+1:])
-		}
 }
 
-	if ts != "" {
-		return fmt.Sprintf("  %s  %s  %s", ts, tag, msg)
-	}
-	return fmt.Sprintf("  %s  %s", tag, msg)
-}
-
-// refreshLogContent rebuilds the log viewport from the full engine log list,
-// filtering before windowing so the entry count and "(n hidden)" reflect all
-// logs, not just the visible viewport slice.
 func (m *Model) refreshLogContent() {
 	var rendered []string
 	total := 0
 	shown := 0
 
-	for _, line := range m.engine.GetLogs() {
+	for _, entry := range m.engine.GetLogs() {
-		if strings.TrimSpace(line) == "" {
+		if strings.TrimSpace(entry.Message) == "" {
 			continue
 		}
 		total++
-		sev := classifyLog(line)
+		sev := classifyLog(entry.Message)
 		if m.logFilterImportant && !isImportantLog(sev) {
 			continue
 		}
 		shown++
-		rendered = append(rendered, m.renderLogLine(line))
+		rendered = append(rendered, m.renderLogLine(entry))
 	}
 
 	m.logTotal = total

internal/tui/tab_logs_sidebar.go

@@ -3,11 +3,12 @@ package tui
 import (
 	"strings"
 
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
 	"github.com/charmbracelet/lipgloss"
 )
 
-func (m Model) renderCompactLogLine(line string, maxW int) string {
+func (m Model) renderCompactLogLine(entry models.LogEntry, maxW int) string {
-	sev := classifyLog(line)
+	sev := classifyLog(entry.Message)
 
 	var tag string
 	switch sev {
@@ -23,34 +24,21 @@ func (m Model) renderCompactLogLine(line string, maxW int) string {
 		tag = m.st.subtleStyle.Render("·")
 	}
 
-	ts := ""
+	ts := entry.CreatedAt.Local().Format("01/02 15:04")
-	msg := line
-	if len(line) > 10 && line[0] == '[' {
-		if idx := strings.Index(line, "]"); idx > 0 && idx < 12 {
-			ts = line[1:idx]
-			msg = strings.TrimSpace(line[idx+1:])
-		}
-	}
 
+	msg := entry.Message
 	msg = strings.TrimPrefix(msg, "Monitor ")
 	msg = strings.TrimPrefix(msg, "Push ")
 
-	// prefix: " HH:MM ● " = 9 visible chars, or " ● " = 3 without timestamp
+	prefixW := len(ts) + 4
-	prefixW := 3
-	if ts != "" {
-		prefixW = len(ts) + 4
-	}
 	msgW := maxW - prefixW
 	if msgW < 5 {
 		msgW = 5
 	}
 	msg = limitStr(msg, msgW)
 
-	if ts != "" {
 	return " " + m.st.subtleStyle.Render(ts) + " " + tag + " " + msg
 }
-	return " " + tag + " " + msg
-}
 
 func (m Model) viewLogsSidebar(width, maxLines int) string {
 	logs := m.engine.GetLogs()
@@ -61,14 +49,14 @@ func (m Model) viewLogsSidebar(width, maxLines int) string {
 	sidebarStyle := lipgloss.NewStyle().Width(width).MaxWidth(width)
 
 	var all []string
-	for _, line := range logs {
+	for _, entry := range logs {
-		if strings.TrimSpace(line) == "" {
+		if strings.TrimSpace(entry.Message) == "" {
 			continue
 		}
-		if m.logFilterImportant && !isImportantLog(classifyLog(line)) {
+		if m.logFilterImportant && !isImportantLog(classifyLog(entry.Message)) {
 			continue
 		}
-		all = append(all, m.renderCompactLogLine(line, width))
+		all = append(all, m.renderCompactLogLine(entry, width))
 	}
 
 	start := m.logScrollOffset
@@ -87,11 +75,11 @@ func (m Model) viewLogsSidebar(width, maxLines int) string {
 func (m *Model) scrollLogs(delta int) {
 	logs := m.engine.GetLogs()
 	total := 0
-	for _, line := range logs {
+	for _, entry := range logs {
-		if strings.TrimSpace(line) == "" {
+		if strings.TrimSpace(entry.Message) == "" {
 			continue
 		}
-		if m.logFilterImportant && !isImportantLog(classifyLog(line)) {
+		if m.logFilterImportant && !isImportantLog(classifyLog(entry.Message)) {
 			continue
 		}
 		total++

internal/tui/update_test.go

@@ -300,7 +300,7 @@ func TestWriteDoneMsg_LogsErrorAndReloads(t *testing.T) {
 	mm := updated.(Model)
 	found := false
 	for _, line := range mm.engine.GetLogs() {
-		if strings.Contains(line, "Delete site failed: boom") {
+		if strings.Contains(line.Message, "Delete site failed: boom") {
 			found = true
 		}
 	}