feat: Add rider substitution system

models/rider_substitutions.go

@@ -0,0 +1,18 @@
+package models
+
+import "time"
+
+// RiderSubstitution represents the rider_substitutions table
+type RiderSubstitution struct {
+	ID              int       `json:"id" gorm:"primaryKey;autoIncrement"`
+	TenantID        int       `json:"tenant_id" gorm:"not null;uniqueIndex:uq_date_absent"`
+	SubDate         string    `json:"sub_date" gorm:"type:date;not null;uniqueIndex:uq_date_absent;index:idx_date;index:idx_tenant_date"`
+	AbsentRiderID   int       `json:"absent_rider_id" gorm:"not null;uniqueIndex:uq_date_absent"`
+	AbsentRiderName string    `json:"absent_rider_name" gorm:"size:100;not null"`
+	SubRiderID      int       `json:"sub_rider_id" gorm:"not null"`
+	SubRiderName    string    `json:"sub_rider_name" gorm:"size:100;not null"`
+	Reason          string    `json:"reason" gorm:"size:255"`
+	Status          string    `json:"status" gorm:"type:enum('scheduled','active','completed','cancelled');default:'scheduled';not null;index:idx_status"`
+	CreatedAt       time.Time `json:"created_at" gorm:"autoCreateTime"`
+	UpdatedAt       time.Time `json:"updated_at" gorm:"autoUpdateTime"`
+}