feat(schema): restore complete Ent schema files

ent/schema/refresh_token.go

@@ -0,0 +1,44 @@
+package schema
+
+import (
+	"time"
+
+	"entgo.io/ent"
+	"entgo.io/ent/schema/field"
+	"entgo.io/ent/schema/index"
+)
+
+// RefreshToken holds the schema definition for the RefreshToken entity.
+type RefreshToken struct {
+	ent.Schema
+}
+
+// Fields of the RefreshToken.
+func (RefreshToken) Fields() []ent.Field {
+	return []ent.Field{
+		field.String("id").
+			Unique().
+			Immutable(),
+		field.String("user_id").
+			NotEmpty().
+			Comment("ID of the user who owns this refresh token"),
+		field.String("token_hash").
+			NotEmpty().
+			Sensitive().
+			Comment("SHA256 hash of the refresh token"),
+		field.Time("expires_at").
+			Comment("When the refresh token expires"),
+		field.Time("created_at").
+			Default(time.Now).
+			Immutable(),
+	}
+}
+
+// Indexes of the RefreshToken.
+func (RefreshToken) Indexes() []ent.Index {
+	return []ent.Index{
+		index.Fields("user_id"),
+		index.Fields("token_hash"),
+		index.Fields("expires_at"),
+	}
+}