diff --git a/packages/experimental/src/VariantSchema.ts b/packages/experimental/src/VariantSchema.ts
index 4da9e9bcd4..27db68a23e 100644
--- a/packages/experimental/src/VariantSchema.ts
+++ b/packages/experimental/src/VariantSchema.ts
@@ -248,7 +248,7 @@ type MissingSelfGeneric<Params extends string = ""> =
  * @since 1.0.0
  * @category constructors
  */
-export const factory = <
+export const make = <
   const Variants extends ReadonlyArray<string>,
   const Default extends Variants[number]
 >(options: {
diff --git a/packages/sql/src/Model.ts b/packages/sql/src/Model.ts
index be07eaeaf4..f95872ddd9 100644
--- a/packages/sql/src/Model.ts
+++ b/packages/sql/src/Model.ts
@@ -9,7 +9,7 @@ const {
   Class,
   Field,
   Struct
-} = VariantSchema.factory({
+} = VariantSchema.make({
   variants: ["select", "insert", "update", "json", "jsonCreate", "jsonUpdate"],
   defaultVariant: "select"
 })
@@ -115,7 +115,7 @@ export interface GeneratedByApp<S extends Schema.Schema.All | Schema.PropertySig
 /**
  * A field that represents a column that is generated by the application.
  *
- * It is required by the database, but not by the application.
+ * It is required by the database, but not by the JSON variants.
  *
  * @since 1.0.0
  * @category schemas
@@ -182,12 +182,17 @@ export const DateTimeFromDate: DateTimeFromDate = Schema.transform(
   }
 )
 
+const DateTimeWithNow = Schema.DateTimeUtc.pipe(
+  Schema.propertySignature,
+  Schema.withConstructorDefault(DateTime.unsafeNow)
+)
+
 const DateTimeFromDateWithNow = DateTimeFromDate.pipe(
   Schema.propertySignature,
   Schema.withConstructorDefault(DateTime.unsafeNow)
 )
 
-const DateTimeWithNow = Schema.DateTimeUtc.pipe(
+const DateTimeFromNumberWithNow = Schema.DateTimeUtcFromNumber.pipe(
   Schema.propertySignature,
   Schema.withConstructorDefault(DateTime.unsafeNow)
 )
@@ -208,7 +213,7 @@ export interface DateTimeInsert extends
  * A field that represents a date-time value that is inserted as the current
  * `DateTime.Utc`. It is serialized as a string for the database.
  *
- * It is removed from updates and is available for selection.
+ * It is omitted from updates and is available for selection.
  *
  * @since 1.0.0
  * @category schemas
@@ -235,7 +240,7 @@ export interface DateTimeInsertFromDate extends
  * A field that represents a date-time value that is inserted as the current
  * `DateTime.Utc`. It is serialized as a `Date` for the database.
  *
- * It is removed from updates and is available for selection.
+ * It is omitted from updates and is available for selection.
  *
  * @since 1.0.0
  * @category schemas
@@ -246,6 +251,33 @@ export const DateTimeInsertFromDate: DateTimeInsertFromDate = Field({
   json: Schema.DateTimeUtc
 })
 
+/**
+ * @since 1.0.0
+ * @category models
+ */
+export interface DateTimeInsertFromNumber extends
+  VariantSchema.Field<{
+    readonly select: typeof Schema.DateTimeUtcFromNumber
+    readonly insert: Schema.PropertySignature<":", DateTime.Utc, never, ":", number, true>
+    readonly json: typeof Schema.DateTimeUtcFromNumber
+  }>
+{}
+
+/**
+ * A field that represents a date-time value that is inserted as the current
+ * `DateTime.Utc`. It is serialized as a `number`.
+ *
+ * It is omitted from updates and is available for selection.
+ *
+ * @since 1.0.0
+ * @category schemas
+ */
+export const DateTimeInsertFromNumber: DateTimeInsertFromNumber = Field({
+  select: Schema.DateTimeUtcFromNumber,
+  insert: DateTimeFromNumberWithNow,
+  json: Schema.DateTimeUtcFromNumber
+})
+
 /**
  * @since 1.0.0
  * @category models
@@ -306,6 +338,36 @@ export const DateTimeUpdateFromDate: DateTimeUpdateFromDate = Field({
   json: Schema.DateTimeUtc
 })
 
+/**
+ * @since 1.0.0
+ * @category models
+ */
+export interface DateTimeUpdateFromNumber extends
+  VariantSchema.Field<{
+    readonly select: typeof Schema.DateTimeUtcFromNumber
+    readonly insert: Schema.PropertySignature<":", DateTime.Utc, never, ":", number, true>
+    readonly update: Schema.PropertySignature<":", DateTime.Utc, never, ":", number, true>
+    readonly json: typeof Schema.DateTimeUtcFromNumber
+  }>
+{}
+
+/**
+ * A field that represents a date-time value that is updated as the current
+ * `DateTime.Utc`. It is serialized as a `number`.
+ *
+ * It is set to the current `DateTime.Utc` on updates and inserts and is
+ * available for selection.
+ *
+ * @since 1.0.0
+ * @category schemas
+ */
+export const DateTimeUpdateFromNumber: DateTimeUpdateFromNumber = Field({
+  select: Schema.DateTimeUtcFromNumber,
+  insert: DateTimeFromNumberWithNow,
+  update: DateTimeFromNumberWithNow,
+  json: Schema.DateTimeUtcFromNumber
+})
+
 /**
  * @since 1.0.0
  * @category models