fix(calendar): split comma-joined GOOGLE_CALENDAR_ID before use

fetchCalendarEvents falls back to config.GoogleCalendarID whenever no
source_configs rows exist yet for the gcal source -- which is the
current live state (0 rows). GoogleCalendarID is a single env var that
itself holds a comma-separated list of calendar IDs, but the whole
joined string was being wrapped in a single-element []string{...} and
passed straight to SetCalendarIDs. Google's API takes one calendarId per
call, so every fetch failed with '404 Not Found' on the literal
comma-joined string -- confirmed live in production logs. This broke all
calendar events, in both the web dashboard and the widget, silently.

Now splits on commas and trims whitespace before use.

1 files changed, 19 insertions, 6 deletions

diff --git a/internal/handlers/handlers.go b/internal/handlers/handlers.go
index d1a7512..0d8b2da 100644
--- a/internal/handlers/handlers.go
+++ b/internal/handlers/handlers.go
@@ -314,9 +314,20 @@ func (h *Handler) fetchCalendarEvents(ctx context.Context, forceRefresh bool) ([
 	}
 
 	if len(enabledIDs) == 0 {
-		// No source_configs synced yet — fall back to the configured calendar ID
+		// No source_configs synced yet — fall back to the configured calendar
+		// ID(s). GoogleCalendarID is a single env var that itself holds a
+		// comma-separated list (see GOOGLE_CALENDAR_ID in .env) -- it must be
+		// split before use. Passing the raw joined string straight through
+		// as a single calendar ID (the previous behavior) sends Google's API
+		// a calendarId that matches nothing, failing every fetch with a 404 —
+		// this is a real production incident, not a hypothetical: it silently
+		// broke all calendar events (web and widget both) until fixed.
 		if len(configs) == 0 && h.config.GoogleCalendarID != "" {
-			enabledIDs = []string{h.config.GoogleCalendarID}
+			for _, id := range strings.Split(h.config.GoogleCalendarID, ",") {
+				if trimmed := strings.TrimSpace(id); trimmed != "" {
+					enabledIDs = append(enabledIDs, trimmed)
+				}
+			}
 		} else {
 			// Configs exist but all disabled — respect that
 			return nil, nil
@@ -326,10 +337,12 @@ func (h *Handler) fetchCalendarEvents(ctx context.Context, forceRefresh bool) ([
 	h.googleCalendarClient.SetCalendarIDs(enabledIDs)
 
 	fetcher := &CacheFetcher[models.CalendarEvent]{
-		Store:        h.store,
-		CacheKey:     store.CacheKeyGoogleCalendar,
-		TTLMinutes:   h.config.CacheTTLMinutes,
-		Fetch:        func(ctx context.Context) ([]models.CalendarEvent, error) { return h.googleCalendarClient.GetUpcomingEvents(ctx, 50) },
+		Store:      h.store,
+		CacheKey:   store.CacheKeyGoogleCalendar,
+		TTLMinutes: h.config.CacheTTLMinutes,
+		Fetch: func(ctx context.Context) ([]models.CalendarEvent, error) {
+			return h.googleCalendarClient.GetUpcomingEvents(ctx, 50)
+		},
 		GetFromCache: h.store.GetCalendarEvents,
 		SaveToCache:  h.store.SaveCalendarEvents,
 	}