diff --git a/internal/models/models.go b/internal/models/models.go
index 2dcf5c3..ffbfe20 100644
--- a/internal/models/models.go
+++ b/internal/models/models.go
@@ -11,8 +11,8 @@ type Participant struct {
 	TimeLimit int       `json:"timeLimit" gorm:"default:120"` // seconds
 	Order     int       `json:"order" gorm:"default:0"`
 	Active    bool      `json:"active" gorm:"default:true"`
-	CreatedAt time.Time `json:"createdAt"`
-	UpdatedAt time.Time `json:"updatedAt"`
+	CreatedAt time.Time `json:"createdAt" tsType:"string"`
+	UpdatedAt time.Time `json:"updatedAt" tsType:"string"`
 }
 
 type Meeting struct {
@@ -20,15 +20,15 @@ type Meeting struct {
 	Name      string           `json:"name" gorm:"not null;default:Daily Standup"`
 	TimeLimit int              `json:"timeLimit" gorm:"default:3600"` // total meeting limit in seconds (1 hour)
 	Sessions  []MeetingSession `json:"sessions,omitempty" gorm:"foreignKey:MeetingID"`
-	CreatedAt time.Time        `json:"createdAt"`
-	UpdatedAt time.Time        `json:"updatedAt"`
+	CreatedAt time.Time        `json:"createdAt" tsType:"string"`
+	UpdatedAt time.Time        `json:"updatedAt" tsType:"string"`
 }
 
 type MeetingSession struct {
 	ID              uint                `json:"id" gorm:"primaryKey"`
 	MeetingID       uint                `json:"meetingId" gorm:"not null"`
-	StartedAt       time.Time           `json:"startedAt"`
-	EndedAt         *time.Time          `json:"endedAt,omitempty"`
+	StartedAt       time.Time           `json:"startedAt" tsType:"string"`
+	EndedAt         *time.Time          `json:"endedAt,omitempty" tsType:"string"`
 	TotalDuration   int                 `json:"totalDuration"` // seconds
 	Completed       bool                `json:"completed" gorm:"default:false"`
 	ParticipantLogs []ParticipantLog    `json:"participantLogs,omitempty" gorm:"foreignKey:SessionID"`
@@ -40,8 +40,8 @@ type ParticipantLog struct {
 	SessionID     uint        `json:"sessionId" gorm:"not null"`
 	ParticipantID uint        `json:"participantId" gorm:"not null"`
 	Participant   Participant `json:"participant,omitempty" gorm:"foreignKey:ParticipantID"`
-	StartedAt     time.Time   `json:"startedAt"`
-	EndedAt       *time.Time  `json:"endedAt,omitempty"`
+	StartedAt     time.Time   `json:"startedAt" tsType:"string"`
+	EndedAt       *time.Time  `json:"endedAt,omitempty" tsType:"string"`
 	Duration      int         `json:"duration"` // seconds
 	Skipped       bool        `json:"skipped" gorm:"default:false"`
 	Overtime      bool        `json:"overtime" gorm:"default:false"`