fix: preserve formatted date message entities

internal/store/postgres/message_helpers_test.go

@@ -0,0 +1,33 @@
+package postgres
+
+import (
+	"testing"
+
+	"telesrv/internal/domain"
+)
+
+func TestMessageEntityJSONRoundTripPreservesFormattedDate(t *testing.T) {
+	in := []domain.MessageEntity{
+		{
+			Type:      domain.MessageEntityFormattedDate,
+			Offset:    2,
+			Length:    5,
+			Date:      1773436800,
+			Relative:  true,
+			ShortTime: true,
+			LongDate:  true,
+			DayOfWeek: true,
+		},
+	}
+	raw, err := encodeMessageEntities(in)
+	if err != nil {
+		t.Fatalf("encodeMessageEntities: %v", err)
+	}
+	out, err := decodeMessageEntities(string(raw))
+	if err != nil {
+		t.Fatalf("decodeMessageEntities: %v", err)
+	}
+	if !sameMessageEntities(in, out) {
+		t.Fatalf("round-trip entities = %+v raw=%s, want %+v", out, raw, in)
+	}
+}