diff --git a/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/DefaultConstraint.kt b/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/DefaultConstraint.kt
new file mode 100644
index 0000000..9d24ccb
--- /dev/null
+++ b/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/DefaultConstraint.kt
@@ -0,0 +1,10 @@
+package ru.landgrafhomyak.serdha.api.v0.ddl
+
+import ru.landgrafhomyak.serdha.api.v0.Expression
+
+public interface DefaultConstraint<RuntimeType, DatabaseType : ColumnType<RuntimeType>, TableUserExtension : Any> {
+	public val name: String
+	public val table: Table<TableUserExtension, *>
+	public val attachedToColumn: Column<RuntimeType, DatabaseType, TableUserExtension>
+	public val expression: Expression<RuntimeType, DatabaseType, TableUserExtension>
+}
\ No newline at end of file
diff --git a/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/ModuleCreator.kt b/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/ModuleCreator.kt
index 8aef13f..a4e08ca 100644
--- a/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/ModuleCreator.kt
+++ b/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/ModuleCreator.kt
@@ -8,8 +8,9 @@ import ru.landgrafhomyak.serdha.api.v0.dml.Select
 import ru.landgrafhomyak.serdha.api.v0.dml.SelectCreator
 import ru.landgrafhomyak.serdha.api.v0.dml.Update
 import ru.landgrafhomyak.serdha.api.v0.dml.UpdateCreator
+import ru.landgrafhomyak.serdha.api.v0.runtime.Transaction
 
-public interface ModuleCreator {
+public interface ModuleCreator : Transaction {
 	public interface CreateTable<TableUserExtension : Any> {
 		public fun createTable(creator: TableCreator<TableUserExtension>): TableUserExtension
 	}
diff --git a/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/ModuleTemplate.kt b/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/ModuleTemplate.kt
index 2751fb3..7327918 100644
--- a/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/ModuleTemplate.kt
+++ b/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/ModuleTemplate.kt
@@ -14,11 +14,11 @@ public interface ModuleTemplate<ModuleUserExtension : Any> {
 	}
 
 	public interface CreateModule<ModuleUserExtension : Any> {
-		public fun createModule(rootNs: Namespace, creator: ModuleCreator): ModuleUserExtension
+		public suspend fun createModule(rootNs: Namespace, creator: ModuleCreator): ModuleUserExtension
 	}
 
 	public interface UpgradeModule<OldModuleUserExtension : Any, NewModuleUserExtension : Any> {
-		public fun upgradeModule(oldModule: Module<OldModuleUserExtension>, rootNs: Namespace, updater: ModuleCreator): NewModuleUserExtension
+		public suspend fun upgradeModule(oldModule: Module<OldModuleUserExtension>, rootNs: Namespace, updater: ModuleCreator): NewModuleUserExtension
 	}
 
 	public val versionKey: String
diff --git a/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/TableCreator.kt b/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/TableCreator.kt
index 1ad1f91..8644598 100644
--- a/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/TableCreator.kt
+++ b/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/TableCreator.kt
@@ -1,39 +1,53 @@
 package ru.landgrafhomyak.serdha.api.v0.ddl
 
-import kotlin.jvm.JvmName
 import ru.landgrafhomyak.serdha.api.v0.Expression
+import ru.landgrafhomyak.serdha.api.v0.LowLevelApi
 
 public interface TableCreator<TableUserExtension : Any> {
 	public val expressionBuilder: Expression.Builder<TableUserExtension>
 
 	public val types: ColumnType.Builder
 
-	/**
-	 * Offers column of type [D][type] with `NOT NULL` constraint named [name] and runtime type [RuntimeType].
-	 *
-	 * @return Descriptor of offered column for future operations.
-	 */
-	public fun <RuntimeType : Any, DatabaseType : ColumnType<RuntimeType>> column(name: String, type: DatabaseType): Column<RuntimeType, DatabaseType, TableUserExtension>
+	public fun <RuntimeType, DatabaseType : ColumnType<RuntimeType>> column(name: String, type: DatabaseType): Column<RuntimeType, DatabaseType, TableUserExtension>
 
 	public fun index(name: String, vararg columns: Column<*, *, TableUserExtension>): Index<TableUserExtension>
 
-	public fun unique(name: String, distinctNulls: Boolean, vararg columns: Column<*, *, TableUserExtension>): UniqueConstraint<TableUserExtension>
-	public fun check(name: String, constraint: Expression<Boolean, ColumnType.BOOLEAN, TableUserExtension>): CheckConstraint<TableUserExtension>
+	public fun uniqueIndex(name: String, distinctNulls: Boolean, vararg columns: Column<*, *, TableUserExtension>): UniqueIndex<TableUserExtension>
+	public fun checkConstraint(name: String, constraint: Expression<Boolean, ColumnType.BOOLEAN, TableUserExtension>): CheckConstraint<TableUserExtension>
+	public fun <RuntimeType : Any, DatabaseType : ColumnType<RuntimeType>> defaultValue(c: Column<RuntimeType, DatabaseType, TableUserExtension>, expr: Expression<RuntimeType, DatabaseType, TableUserExtension>): DefaultConstraint<RuntimeType, DatabaseType, TableUserExtension>
 
 	@Suppress("PropertyName")
 	public val rowId_column: Column<RowId<TableUserExtension>, ColumnType<RowId<TableUserExtension>>, TableUserExtension>
 
 	@Suppress("PropertyName")
-	public val rowId_uniqueConstraint: UniqueConstraint<TableUserExtension>
+	public val rowId_uniqueConstraint: UniqueIndex<TableUserExtension>
 
+	@Suppress("FunctionName")
+	@LowLevelApi
+	public fun <TargetTableUserWrapper : Any> _foreignKey(
+		fromColumns: Array<Column<*, *, TableUserExtension>>,
+		toTable: Table<TargetTableUserWrapper, *>,
+		toColumns: Array<Column<*, *, TargetTableUserWrapper>>,
+		onUpdate: ForeignKey.OnUpdateAction,
+		onDelete: ForeignKey.OnDeleteAction,
+	): ForeignKey<TableUserExtension, TargetTableUserWrapper>
+
+	@OptIn(LowLevelApi::class)
 	public fun <TargetTableUserWrapper : Any, ColumnType1 : ColumnType<*>> foreignKey(
 		fromColumn: Column<*, ColumnType1, TableUserExtension>,
 		toTable: Table<TargetTableUserWrapper, *>,
 		toColumn: Column<*, ColumnType1, TargetTableUserWrapper>,
 		onUpdate: ForeignKey.OnUpdateAction,
 		onDelete: ForeignKey.OnDeleteAction,
-	): ForeignKey<TableUserExtension, TargetTableUserWrapper>
+	): ForeignKey<TableUserExtension, TargetTableUserWrapper> = this._foreignKey(
+		fromColumns = arrayOf(fromColumn),
+		toTable = toTable,
+		toColumns = arrayOf(toColumn),
+		onUpdate = onUpdate,
+		onDelete = onDelete
+	)
 
+	@OptIn(LowLevelApi::class)
 	public fun <TargetTableUserWrapper : Any, ColumnType1 : ColumnType<*>, ColumnType2 : ColumnType<*>> foreignKey(
 		fromColumn1: Column<*, ColumnType1, TableUserExtension>,
 		fromColumn2: Column<*, ColumnType2, TableUserExtension>,
@@ -42,8 +56,15 @@ public interface TableCreator<TableUserExtension : Any> {
 		toColumn2: Column<*, ColumnType2, TargetTableUserWrapper>,
 		onUpdate: ForeignKey.OnUpdateAction,
 		onDelete: ForeignKey.OnDeleteAction,
-	): ForeignKey<TableUserExtension, TargetTableUserWrapper>
+	): ForeignKey<TableUserExtension, TargetTableUserWrapper> = this._foreignKey(
+		fromColumns = arrayOf(fromColumn1, fromColumn2),
+		toTable = toTable,
+		toColumns = arrayOf(toColumn1, toColumn2),
+		onUpdate = onUpdate,
+		onDelete = onDelete
+	)
 
+	@OptIn(LowLevelApi::class)
 	public fun <TargetTableUserWrapper : Any, ColumnType1 : ColumnType<*>, ColumnType2 : ColumnType<*>, ColumnType3 : ColumnType<*>> foreignKey(
 		fromColumn1: Column<*, ColumnType1, TableUserExtension>,
 		fromColumn2: Column<*, ColumnType2, TableUserExtension>,
@@ -54,5 +75,11 @@ public interface TableCreator<TableUserExtension : Any> {
 		toColumn3: Column<*, ColumnType3, TargetTableUserWrapper>,
 		onUpdate: ForeignKey.OnUpdateAction,
 		onDelete: ForeignKey.OnDeleteAction,
-	): ForeignKey<TableUserExtension, TargetTableUserWrapper>
+	): ForeignKey<TableUserExtension, TargetTableUserWrapper> = this._foreignKey(
+		fromColumns = arrayOf(fromColumn1, fromColumn2, fromColumn3),
+		toTable = toTable,
+		toColumns = arrayOf(toColumn1, toColumn2, toColumn3),
+		onUpdate = onUpdate,
+		onDelete = onDelete
+	)
 }
\ No newline at end of file
diff --git a/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/TableUpdater.kt b/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/TableUpdater.kt
index 30f53eb..8644c23 100644
--- a/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/TableUpdater.kt
+++ b/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/TableUpdater.kt
@@ -4,27 +4,35 @@ import ru.landgrafhomyak.serdha.api.v0.Expression
 
 
 public interface TableUpdater<TableNewUserExtension : Any, TableOldUserExtension : Any> : TableCreator<TableNewUserExtension> {
+	public val oldExpressionBuilder: Expression.Builder<TableOldUserExtension>
+
 	public fun <RuntimeType, DatabaseType : ColumnType<RuntimeType>> keepColumn(c: Column<RuntimeType, DatabaseType, TableOldUserExtension>): Column<RuntimeType, DatabaseType, TableNewUserExtension>
-	public fun <RuntimeType, DatabaseType : ColumnType<RuntimeType>> renameColumn(c: Column<RuntimeType, DatabaseType, TableOldUserExtension>, newName: String): Column<RuntimeType, DatabaseType, TableNewUserExtension>
-	public fun <RuntimeType, DatabaseType : ColumnType<RuntimeType>> mapColumn(c: Column<RuntimeType, DatabaseType, TableNewUserExtension>, newValue: Expression<RuntimeType, DatabaseType, TableNewUserExtension>, where: Expression<Boolean, ColumnType.BOOLEAN, TableNewUserExtension>?)
-	public fun <RuntimeType, DatabaseType : ColumnType<RuntimeType>> mapColumn(c: Column<RuntimeType, DatabaseType, TableNewUserExtension>, newValue: Expression<RuntimeType, DatabaseType, TableNewUserExtension>): Unit = this.mapColumn(c, newValue, null)
+	public fun <RuntimeType, DatabaseType : ColumnType<RuntimeType>> renameAndKeepColumn(c: Column<RuntimeType, DatabaseType, TableOldUserExtension>, newName: String): Column<RuntimeType, DatabaseType, TableNewUserExtension>
+	public fun <RuntimeType, DatabaseType : ColumnType<RuntimeType>> mapAndKeepColumn(c: Column<*, *, TableOldUserExtension>, newValue: Expression<RuntimeType, DatabaseType, TableOldUserExtension>, where: Expression<Boolean, ColumnType.BOOLEAN, TableNewUserExtension>?): Column<RuntimeType, DatabaseType, TableNewUserExtension>
+	public fun <RuntimeType, DatabaseType : ColumnType<RuntimeType>> mapAndKeepColumn(c: Column<*, *, TableOldUserExtension>, newValue: Expression<RuntimeType, DatabaseType, TableOldUserExtension>): Column<RuntimeType, DatabaseType, TableNewUserExtension> = this.mapAndKeepColumn(c, newValue, null)
+	public fun <RuntimeType, DatabaseType : ColumnType<RuntimeType>> mapAndRenameAndKeepColumn(c: Column<*, *, TableOldUserExtension>, newName: String, newValue: Expression<RuntimeType, DatabaseType, TableOldUserExtension>, where: Expression<Boolean, ColumnType.BOOLEAN, TableNewUserExtension>?): Column<RuntimeType, DatabaseType, TableNewUserExtension>
+	public fun <RuntimeType, DatabaseType : ColumnType<RuntimeType>> mapAndRenameAndKeepColumn(c: Column<*, *, TableOldUserExtension>, newName: String, newValue: Expression<RuntimeType, DatabaseType, TableOldUserExtension>): Column<RuntimeType, DatabaseType, TableNewUserExtension> = this.mapAndRenameAndKeepColumn(c, newName, newValue, null)
 	public fun deleteColumn(c: Column<*, *, TableOldUserExtension>)
 
 	public fun keepIndex(i: Index<TableOldUserExtension>): Index<TableNewUserExtension>
-	public fun renameIndex(i: Index<TableOldUserExtension>, newName: String): Index<TableNewUserExtension>
+	public fun renameAndKeepIndex(i: Index<TableOldUserExtension>, newName: String): Index<TableNewUserExtension>
 	public fun deleteIndex(i: Index<TableOldUserExtension>)
 
 	public fun keepCheck(i: CheckConstraint<TableOldUserExtension>): CheckConstraint<TableNewUserExtension>
-	public fun renameCheck(i: CheckConstraint<TableOldUserExtension>, newName: String): CheckConstraint<TableNewUserExtension>
+	public fun renameAndKeepCheck(i: CheckConstraint<TableOldUserExtension>, newName: String): CheckConstraint<TableNewUserExtension>
 	public fun deleteCheck(i: CheckConstraint<TableOldUserExtension>)
 
-	public fun keepUnique(i: UniqueConstraint<TableOldUserExtension>): UniqueConstraint<TableNewUserExtension>
-	public fun renameUnique(i: UniqueConstraint<TableOldUserExtension>, newName: String): UniqueConstraint<TableNewUserExtension>
-	public fun deleteUnique(i: UniqueConstraint<TableOldUserExtension>)
+	public fun keepUniqueIndex(i: UniqueIndex<TableOldUserExtension>): UniqueIndex<TableNewUserExtension>
+	public fun renameAndKeepUniqueIndex(i: UniqueIndex<TableOldUserExtension>, newName: String): UniqueIndex<TableNewUserExtension>
+	public fun deleteUniqueIndex(i: UniqueIndex<TableOldUserExtension>)
+
+	public fun <RuntimeType, DatabaseType : ColumnType<RuntimeType>> keepDefaultValue(c: Column<RuntimeType, DatabaseType, TableNewUserExtension>, d: DefaultConstraint<RuntimeType, DatabaseType, TableOldUserExtension>): DefaultConstraint<RuntimeType, DatabaseType, TableNewUserExtension>
+	public fun <RuntimeType, DatabaseType : ColumnType<RuntimeType>> changeDefaultValue(c: Column<RuntimeType, DatabaseType, TableNewUserExtension>, d: DefaultConstraint<*, *, TableOldUserExtension>): DefaultConstraint<RuntimeType, DatabaseType, TableNewUserExtension>
+	public fun deleteDefaultValue(i: DefaultConstraint<*, *, TableOldUserExtension>)
 
 	public fun <TargetTableOldUserWrapper : Any, TargetTableNewUserWrapper : Any> keepForeignKeyToUpdatedTable(i: ForeignKey<TableOldUserExtension, TargetTableOldUserWrapper>, updatedTable: Table<TargetTableNewUserWrapper, TargetTableOldUserWrapper>): ForeignKey<TableNewUserExtension, TargetTableNewUserWrapper>
 	public fun <TargetTableUserWrapper : Any> keepForeignKey(i: ForeignKey<TableOldUserExtension, TargetTableUserWrapper>): ForeignKey<TableNewUserExtension, TargetTableUserWrapper>
-	public fun <TargetTableOldUserWrapper : Any, TargetTableNewUserWrapper : Any> renameForeignKeyToUpdatedTable(i: ForeignKey<TableOldUserExtension, TargetTableOldUserWrapper>, updatedTable: Table<TargetTableNewUserWrapper, TargetTableOldUserWrapper>): ForeignKey<TableNewUserExtension, TargetTableNewUserWrapper>
-	public fun <TargetTableUserWrapper : Any> renameForeignKey(i: ForeignKey<TableOldUserExtension, TargetTableUserWrapper>): ForeignKey<TableNewUserExtension, TargetTableUserWrapper>
+	public fun <TargetTableOldUserWrapper : Any, TargetTableNewUserWrapper : Any> renameAndKeepForeignKeyToUpdatedTable(i: ForeignKey<TableOldUserExtension, TargetTableOldUserWrapper>, updatedTable: Table<TargetTableNewUserWrapper, TargetTableOldUserWrapper>): ForeignKey<TableNewUserExtension, TargetTableNewUserWrapper>
+	public fun <TargetTableUserWrapper : Any> renameAndKeepForeignKey(i: ForeignKey<TableOldUserExtension, TargetTableUserWrapper>): ForeignKey<TableNewUserExtension, TargetTableUserWrapper>
 	public fun deleteForeignKey(i: ForeignKey<TableOldUserExtension, *>)
 }
\ No newline at end of file
diff --git a/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/UniqueConstraint.kt b/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/UniqueIndex.kt
similarity index 73%
rename from src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/UniqueConstraint.kt
rename to src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/UniqueIndex.kt
index 886d791..d01fe2f 100644
--- a/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/UniqueConstraint.kt
+++ b/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/ddl/UniqueIndex.kt
@@ -1,6 +1,6 @@
 package ru.landgrafhomyak.serdha.api.v0.ddl
 
-public interface UniqueConstraint<OwnerTableUserExtension : Any> {
+public interface UniqueIndex<OwnerTableUserExtension : Any> {
 	public val name: String
 	public val table: Table<OwnerTableUserExtension, *>
 	public val columns: List<Column<*, *, OwnerTableUserExtension>>
diff --git a/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/dml/InsertCreator.kt b/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/dml/InsertCreator.kt
index feda927..c9928ff 100644
--- a/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/dml/InsertCreator.kt
+++ b/src/commonMain/kotlin/ru/landgrafhomyak/serdha/api/v0/dml/InsertCreator.kt
@@ -3,7 +3,7 @@ package ru.landgrafhomyak.serdha.api.v0.dml
 import ru.landgrafhomyak.serdha.api.v0.Expression
 import ru.landgrafhomyak.serdha.api.v0.ddl.Column
 import ru.landgrafhomyak.serdha.api.v0.ddl.ColumnType
-import ru.landgrafhomyak.serdha.api.v0.ddl.UniqueConstraint
+import ru.landgrafhomyak.serdha.api.v0.ddl.UniqueIndex
 
 public interface InsertCreator<TargetTableUserExtension : Any, QueryUserExtension : Any> : _CommonQueryMethods<QueryUserExtension> {
 	public val insertedValues: SelectedTable<TargetTableUserExtension, QueryUserExtension>
@@ -15,11 +15,11 @@ public interface InsertCreator<TargetTableUserExtension : Any, QueryUserExtensio
 		public fun <RuntimeType, DatabaseType : ColumnType<RuntimeType>> updateColumn(c: Column<RuntimeType, DatabaseType, TargetTableUserExtension>, e: Expression<RuntimeType, DatabaseType, QueryUserExtension>)
 	}
 
-	public fun onConflictUpdate(u: UniqueConstraint<TargetTableUserExtension>, c: (_UpsertCreator<TargetTableUserExtension, QueryUserExtension>) -> Unit)
+	public fun onConflictUpdate(u: UniqueIndex<TargetTableUserExtension>, c: (_UpsertCreator<TargetTableUserExtension, QueryUserExtension>) -> Unit)
 
-	public fun onConflictThrow(u: UniqueConstraint<TargetTableUserExtension>)
+	public fun onConflictThrow(u: UniqueIndex<TargetTableUserExtension>)
 
-	public fun onConflictIgnore(u: UniqueConstraint<TargetTableUserExtension>)
+	public fun onConflictIgnore(u: UniqueIndex<TargetTableUserExtension>)
 
 	public val returningInserted: _CommonQueryMethods._Returning<QueryUserExtension>