multiple tries

backend/v3/storage/database/repository/clause.go

@@ -0,0 +1,160 @@
+package repository
+
+import (
+	"fmt"
+
+	"github.com/zitadel/zitadel/backend/v3/domain"
+)
+
+type field interface {
+	fmt.Stringer
+}
+
+type fieldDescriptor struct {
+	schema string
+	table  string
+	name   string
+}
+
+func (f fieldDescriptor) String() string {
+	return f.schema + "." + f.table + "." + f.name
+}
+
+type ignoreCaseFieldDescriptor struct {
+	fieldDescriptor
+	fieldNameSuffix string
+}
+
+func (f ignoreCaseFieldDescriptor) String() string {
+	return f.fieldDescriptor.String() + f.fieldNameSuffix
+}
+
+type textFieldDescriptor struct {
+	field
+	isIgnoreCase bool
+}
+
+type clause[Op domain.Operation] struct {
+	field field
+	op    Op
+}
+
+const (
+	schema    = "zitadel"
+	userTable = "users"
+)
+
+var userFields = map[domain.UserField]field{
+	domain.UserFieldInstanceID: fieldDescriptor{
+		schema: schema,
+		table:  userTable,
+		name:   "instance_id",
+	},
+	domain.UserFieldOrgID: fieldDescriptor{
+		schema: schema,
+		table:  userTable,
+		name:   "org_id",
+	},
+	domain.UserFieldID: fieldDescriptor{
+		schema: schema,
+		table:  userTable,
+		name:   "id",
+	},
+	domain.UserFieldUsername: textFieldDescriptor{
+		field: ignoreCaseFieldDescriptor{
+			fieldDescriptor: fieldDescriptor{
+				schema: schema,
+				table:  userTable,
+				name:   "username",
+			},
+			fieldNameSuffix: "_lower",
+		},
+	},
+	domain.UserHumanFieldEmail: textFieldDescriptor{
+		field: ignoreCaseFieldDescriptor{
+			fieldDescriptor: fieldDescriptor{
+				schema: schema,
+				table:  userTable,
+				name:   "email",
+			},
+			fieldNameSuffix: "_lower",
+		},
+	},
+	domain.UserHumanFieldEmailVerified: fieldDescriptor{
+		schema: schema,
+		table:  userTable,
+		name:   "email_is_verified",
+	},
+}
+
+type textClause[V domain.Text] struct {
+	clause[domain.TextOperation]
+	value V
+}
+
+var textOp map[domain.TextOperation]string = map[domain.TextOperation]string{
+	domain.TextOperationEqual:                " = ",
+	domain.TextOperationNotEqual:             " <> ",
+	domain.TextOperationStartsWith:           " LIKE ",
+	domain.TextOperationStartsWithIgnoreCase: " LIKE ",
+}
+
+func (tc textClause[V]) Write(stmt *statement) {
+	placeholder := stmt.appendArg(tc.value)
+	var (
+		left, right string
+	)
+	switch tc.clause.op {
+	case domain.TextOperationEqual:
+		left = tc.clause.field.String()
+		right = placeholder
+	case domain.TextOperationNotEqual:
+		left = tc.clause.field.String()
+		right = placeholder
+	case domain.TextOperationStartsWith:
+		left = tc.clause.field.String()
+		right = placeholder + "%"
+	case domain.TextOperationStartsWithIgnoreCase:
+		left = tc.clause.field.String()
+		if _, ok := tc.clause.field.(ignoreCaseFieldDescriptor); !ok {
+			left = "LOWER(" + left + ")"
+		}
+		right = "LOWER(" + placeholder + "%)"
+	}
+
+	stmt.builder.WriteString(left)
+	stmt.builder.WriteString(textOp[tc.clause.op])
+	stmt.builder.WriteString(right)
+}
+
+type boolClause[V domain.Bool] struct {
+	clause[domain.BoolOperation]
+	value V
+}
+
+func (bc boolClause[V]) Write(stmt *statement) {
+	if !bc.value {
+		stmt.builder.WriteString("NOT ")
+	}
+	stmt.builder.WriteString(bc.clause.field.String())
+}
+
+type numberClause[V domain.Number] struct {
+	clause[domain.NumberOperation]
+	value V
+}
+
+var numberOp map[domain.NumberOperation]string = map[domain.NumberOperation]string{
+	domain.NumberOperationEqual:              " = ",
+	domain.NumberOperationNotEqual:           " <> ",
+	domain.NumberOperationLessThan:           " < ",
+	domain.NumberOperationLessThanOrEqual:    " <= ",
+	domain.NumberOperationGreaterThan:        " > ",
+	domain.NumberOperationGreaterThanOrEqual: " >= ",
+}
+
+func (nc numberClause[V]) Write(stmt *statement) {
+	stmt.builder.WriteString(nc.clause.field.String())
+	stmt.builder.WriteString(numberOp[nc.clause.op])
+	stmt.builder.WriteString(stmt.appendArg(nc.value))
+}

backend/v3/storage/database/repository/crypto.go

@@ -0,0 +1,45 @@
+package repository
+
+import (
+	"context"
+
+	"github.com/zitadel/zitadel/backend/v3/domain"
+	"github.com/zitadel/zitadel/backend/v3/storage/database"
+	"github.com/zitadel/zitadel/internal/crypto"
+)
+
+type cryptoRepo struct {
+	database.QueryExecutor
+}
+
+func Crypto(db database.QueryExecutor) domain.CryptoRepository {
+	return &cryptoRepo{
+		QueryExecutor: db,
+	}
+}
+
+const getEncryptionConfigQuery = "SELECT" +
+	" length" +
+	", expiry" +
+	", should_include_lower_letters" +
+	", should_include_upper_letters" +
+	", should_include_digits" +
+	", should_include_symbols" +
+	" FROM encryption_config"
+
+func (repo *cryptoRepo) GetEncryptionConfig(ctx context.Context) (*crypto.GeneratorConfig, error) {
+	var config crypto.GeneratorConfig
+	row := repo.QueryRow(ctx, getEncryptionConfigQuery)
+	err := row.Scan(
+		&config.Length,
+		&config.Expiry,
+		&config.IncludeLowerLetters,
+		&config.IncludeUpperLetters,
+		&config.IncludeDigits,
+		&config.IncludeSymbols,
+	)
+	if err != nil {
+		return nil, err
+	}
+	return &config, nil
+}

backend/v3/storage/database/repository/doc.go

@@ -0,0 +1,7 @@
+// Repository package provides the database repository for the application.
+// It contains the implementation of the [repository pattern](https://martinfowler.com/eaaCatalog/repository.html) for the database.
+
+// funcs which need to interact with the database should create interfaces which are implemented by the
+// [query] and [exec] structs respectively their factory methods [Query] and [Execute]. The [query] struct is used for read operations, while the [exec] struct is used for write operations.
+
+package repository

backend/v3/storage/database/repository/instance.go

@@ -0,0 +1,54 @@
+package repository
+
+import (
+	"context"
+
+	"github.com/zitadel/zitadel/backend/v3/domain"
+	"github.com/zitadel/zitadel/backend/v3/storage/database"
+)
+
+type instance struct {
+	database.QueryExecutor
+}
+
+func Instance(client database.QueryExecutor) domain.InstanceRepository {
+	return &instance{QueryExecutor: client}
+}
+
+func (i *instance) ByID(ctx context.Context, id string) (*domain.Instance, error) {
+	var instance domain.Instance
+	err := i.QueryExecutor.QueryRow(ctx, `SELECT id, name, created_at, updated_at, deleted_at FROM instances WHERE id = $1`, id).Scan(
+		&instance.ID,
+		&instance.Name,
+		&instance.CreatedAt,
+		&instance.UpdatedAt,
+		&instance.DeletedAt,
+	)
+	if err != nil {
+		return nil, err
+	}
+	return &instance, nil
+}
+
+const createInstanceStmt = `INSERT INTO instances (id, name) VALUES ($1, $2) RETURNING created_at, updated_at`
+
+// Create implements [domain.InstanceRepository].
+func (i *instance) Create(ctx context.Context, instance *domain.Instance) error {
+	return i.QueryExecutor.QueryRow(ctx, createInstanceStmt,
+		instance.ID,
+		instance.Name,
+	).Scan(
+		&instance.CreatedAt,
+		&instance.UpdatedAt,
+	)
+}
+
+// On implements [domain.InstanceRepository].
+func (i *instance) On(id string) domain.InstanceOperation {
+	return &instanceOperation{
+		QueryExecutor: i.QueryExecutor,
+		id:            id,
+	}
+}
+
+var _ domain.InstanceRepository = (*instance)(nil)

backend/v3/storage/database/repository/instance_operation.go

@@ -0,0 +1,52 @@
+package repository
+
+import (
+	"context"
+
+	"github.com/zitadel/zitadel/backend/v3/domain"
+	"github.com/zitadel/zitadel/backend/v3/storage/database"
+)
+
+type instanceOperation struct {
+	database.QueryExecutor
+	id string
+}
+
+const addInstanceAdminStmt = `INSERT INTO instance_admins (instance_id, user_id, roles) VALUES ($1, $2, $3)`
+
+// AddAdmin implements [domain.InstanceOperation].
+func (i *instanceOperation) AddAdmin(ctx context.Context, userID string, roles []string) error {
+	return i.QueryExecutor.Exec(ctx, addInstanceAdminStmt, i.id, userID, roles)
+}
+
+// Delete implements [domain.InstanceOperation].
+func (i *instanceOperation) Delete(ctx context.Context) error {
+	return i.QueryExecutor.Exec(ctx, `DELETE FROM instances WHERE id = $1`, i.id)
+}
+
+const removeInstanceAdminStmt = `DELETE FROM instance_admins WHERE instance_id = $1 AND user_id = $2`
+
+// RemoveAdmin implements [domain.InstanceOperation].
+func (i *instanceOperation) RemoveAdmin(ctx context.Context, userID string) error {
+	return i.QueryExecutor.Exec(ctx, removeInstanceAdminStmt, i.id, userID)
+}
+
+const setInstanceAdminRolesStmt = `UPDATE instance_admins SET roles = $1 WHERE instance_id = $2 AND user_id = $3`
+
+// SetAdminRoles implements [domain.InstanceOperation].
+func (i *instanceOperation) SetAdminRoles(ctx context.Context, userID string, roles []string) error {
+	return i.QueryExecutor.Exec(ctx, setInstanceAdminRolesStmt, roles, i.id, userID)
+}
+
+const updateInstanceStmt = `UPDATE instances SET name = $1, updated_at = $2 WHERE id = $3 RETURNING updated_at`
+
+// Update implements [domain.InstanceOperation].
+func (i *instanceOperation) Update(ctx context.Context, instance *domain.Instance) error {
+	return i.QueryExecutor.QueryRow(ctx, updateInstanceStmt,
+		instance.Name,
+		instance.UpdatedAt,
+		i.id,
+	).Scan(&instance.UpdatedAt)
+}
+
+var _ domain.InstanceOperation = (*instanceOperation)(nil)

backend/v3/storage/database/repository/query.go

@@ -0,0 +1,17 @@
+package repository
+
+import (
+	"github.com/zitadel/zitadel/backend/v3/storage/database"
+)
+
+type query struct{ database.Querier }
+
+func Query(querier database.Querier) *query {
+	return &query{Querier: querier}
+}
+
+type executor struct{ database.Executor }
+
+func Execute(exec database.Executor) *executor {
+	return &executor{Executor: exec}
+}

backend/v3/storage/database/repository/statement.go

@@ -0,0 +1,21 @@
+package repository
+
+import "strings"
+
+type statement struct {
+	builder strings.Builder
+	args    []any
+}
+
+func (s *statement) appendArg(arg any) (placeholder string) {
+	s.args = append(s.args, arg)
+	return "$" + string(len(s.args))
+}
+
+func (s *statement) appendArgs(args ...any) (placeholders []string) {
+	placeholders = make([]string, len(args))
+	for i, arg := range args {
+		placeholders[i] = s.appendArg(arg)
+	}
+	return placeholders
+}

backend/v3/storage/database/repository/stmt/column.go

@@ -0,0 +1,43 @@
+package stmt
+
+import "fmt"
+
+type Column[T any] interface {
+	fmt.Stringer
+	statementApplier[T]
+	scanner(t *T) any
+}
+
+type columnDescriptor[T any] struct {
+	name string
+	scan func(*T) any
+}
+
+func (cd columnDescriptor[T]) scanner(t *T) any {
+	return cd.scan(t)
+}
+
+// Apply implements [Column].
+func (f columnDescriptor[T]) Apply(stmt *statement[T]) {
+	stmt.builder.WriteString(stmt.columnPrefix())
+	stmt.builder.WriteString(f.String())
+}
+
+// String implements [Column].
+func (f columnDescriptor[T]) String() string {
+	return f.name
+}
+
+var _ Column[any] = (*columnDescriptor[any])(nil)
+
+type ignoreCaseColumnDescriptor[T any] struct {
+	columnDescriptor[T]
+	fieldNameSuffix string
+}
+
+func (f ignoreCaseColumnDescriptor[T]) ApplyIgnoreCase(stmt *statement[T]) {
+	stmt.builder.WriteString(f.String())
+	stmt.builder.WriteString(f.fieldNameSuffix)
+}
+
+var _ Column[any] = (*ignoreCaseColumnDescriptor[any])(nil)

backend/v3/storage/database/repository/stmt/condition.go

@@ -0,0 +1,97 @@
+package stmt
+
+import "fmt"
+
+type statementApplier[T any] interface {
+	// Apply writes the statement to the builder.
+	Apply(stmt *statement[T])
+}
+
+type Condition[T any] interface {
+	statementApplier[T]
+}
+
+type op interface {
+	TextOperation | NumberOperation | ListOperation
+	fmt.Stringer
+}
+
+type operation[T any, O op] struct {
+	o O
+}
+
+func (o operation[T, O]) String() string {
+	return o.o.String()
+}
+
+func (o operation[T, O]) Apply(stmt *statement[T]) {
+	stmt.builder.WriteString(o.o.String())
+}
+
+type condition[V, T any, OP op] struct {
+	field Column[T]
+	op    OP
+	value V
+}
+
+func (c *condition[V, T, OP]) Apply(stmt *statement[T]) {
+	// placeholder := stmt.appendArg(c.value)
+	stmt.builder.WriteString(stmt.columnPrefix())
+	stmt.builder.WriteString(c.field.String())
+	// stmt.builder.WriteString(c.op)
+	// stmt.builder.WriteString(placeholder)
+}
+
+type and[T any] struct {
+	conditions []Condition[T]
+}
+
+func And[T any](conditions ...Condition[T]) *and[T] {
+	return &and[T]{
+		conditions: conditions,
+	}
+}
+
+// Apply implements [Condition].
+func (a *and[T]) Apply(stmt *statement[T]) {
+	if len(a.conditions) > 1 {
+		stmt.builder.WriteString("(")
+		defer stmt.builder.WriteString(")")
+	}
+
+	for i, condition := range a.conditions {
+		if i > 0 {
+			stmt.builder.WriteString(" AND ")
+		}
+		condition.Apply(stmt)
+	}
+}
+
+var _ Condition[any] = (*and[any])(nil)
+
+type or[T any] struct {
+	conditions []Condition[T]
+}
+
+func Or[T any](conditions ...Condition[T]) *or[T] {
+	return &or[T]{
+		conditions: conditions,
+	}
+}
+
+// Apply implements [Condition].
+func (o *or[T]) Apply(stmt *statement[T]) {
+	if len(o.conditions) > 1 {
+		stmt.builder.WriteString("(")
+		defer stmt.builder.WriteString(")")
+	}
+
+	for i, condition := range o.conditions {
+		if i > 0 {
+			stmt.builder.WriteString(" OR ")
+		}
+		condition.Apply(stmt)
+	}
+}
+
+var _ Condition[any] = (*or[any])(nil)

backend/v3/storage/database/repository/stmt/list.go

@@ -0,0 +1,71 @@
+package stmt
+
+type ListEntry interface {
+	Number | Text | any
+}
+
+type ListCondition[E ListEntry, T any] struct {
+	condition[[]E, T, ListOperation]
+}
+
+func (lc *ListCondition[E, T]) Apply(stmt *statement[T]) {
+	placeholder := stmt.appendArg(lc.value)
+
+	switch lc.op {
+	case ListOperationEqual, ListOperationNotEqual:
+		lc.field.Apply(stmt)
+		operation[T, ListOperation]{lc.op}.Apply(stmt)
+		stmt.builder.WriteString(placeholder)
+	case ListOperationContainsAny, ListOperationContainsAll:
+		lc.field.Apply(stmt)
+		operation[T, ListOperation]{lc.op}.Apply(stmt)
+		stmt.builder.WriteString(placeholder)
+	case ListOperationNotContainsAny, ListOperationNotContainsAll:
+		stmt.builder.WriteString("NOT (")
+		lc.field.Apply(stmt)
+		operation[T, ListOperation]{lc.op}.Apply(stmt)
+		stmt.builder.WriteString(placeholder)
+		stmt.builder.WriteString(")")
+	default:
+		panic("unknown list operation")
+	}
+}
+
+type ListOperation uint8
+
+const (
+	// ListOperationEqual checks if the arrays are equal including the order of the elements
+	ListOperationEqual ListOperation = iota + 1
+	// ListOperationNotEqual checks if the arrays are not equal including the order of the elements
+	ListOperationNotEqual
+
+	// ListOperationContains checks if the array column contains all the values of the specified array
+	ListOperationContainsAll
+	// ListOperationContainsAny checks if the arrays have at least one value in common
+	ListOperationContainsAny
+	// ListOperationContainsAll checks if the array column contains all the values of the specified array
+
+	// ListOperationNotContainsAll checks if the specified array is not contained by the column
+	ListOperationNotContainsAll
+	// ListOperationNotContainsAny checks if the arrays column contains none of the values of the specified array
+	ListOperationNotContainsAny
+)
+
+var listOperations = map[ListOperation]string{
+	// ListOperationEqual checks if the lists are equal
+	ListOperationEqual: " = ",
+	// ListOperationNotEqual checks if the lists are not equal
+	ListOperationNotEqual: " <> ",
+	// ListOperationContainsAny checks if the arrays have at least one value in common
+	ListOperationContainsAny: " && ",
+	// ListOperationContainsAll checks if the array column contains all the values of the specified array
+	ListOperationContainsAll: " @> ",
+	// ListOperationNotContainsAny checks if the arrays column contains none of the values of the specified array
+	ListOperationNotContainsAny: " && ", // Base operator for NOT (A && B)
+	// ListOperationNotContainsAll checks if the array column is not contained by the specified array
+	ListOperationNotContainsAll: " <@ ", // Base operator for NOT (A <@ B)
+}
+
+func (lo ListOperation) String() string {
+	return listOperations[lo]
+}

backend/v3/storage/database/repository/stmt/number.go

@@ -0,0 +1,61 @@
+package stmt
+
+import (
+	"time"
+
+	"golang.org/x/exp/constraints"
+)
+
+type Number interface {
+	constraints.Integer | constraints.Float | constraints.Complex | time.Time | time.Duration
+}
+
+type between[N Number] struct {
+	min, max N
+}
+
+type NumberBetween[V Number, T any] struct {
+	condition[between[V], T, NumberOperation]
+}
+
+func (nb *NumberBetween[V, T]) Apply(stmt *statement[T]) {
+	nb.field.Apply(stmt)
+	stmt.builder.WriteString(" BETWEEN ")
+	stmt.builder.WriteString(stmt.appendArg(nb.value.min))
+	stmt.builder.WriteString(" AND ")
+	stmt.builder.WriteString(stmt.appendArg(nb.value.max))
+}
+
+type NumberCondition[V Number, T any] struct {
+	condition[V, T, NumberOperation]
+}
+
+func (nc *NumberCondition[V, T]) Apply(stmt *statement[T]) {
+	nc.field.Apply(stmt)
+	operation[T, NumberOperation]{nc.op}.Apply(stmt)
+	stmt.builder.WriteString(stmt.appendArg(nc.value))
+}
+
+type NumberOperation uint8
+
+const (
+	NumberOperationEqual NumberOperation = iota + 1
+	NumberOperationNotEqual
+	NumberOperationLessThan
+	NumberOperationLessThanOrEqual
+	NumberOperationGreaterThan
+	NumberOperationGreaterThanOrEqual
+)
+
+var numberOperations = map[NumberOperation]string{
+	NumberOperationEqual:              " = ",
+	NumberOperationNotEqual:           " <> ",
+	NumberOperationLessThan:           " < ",
+	NumberOperationLessThanOrEqual:    " <= ",
+	NumberOperationGreaterThan:        " > ",
+	NumberOperationGreaterThanOrEqual: " >= ",
+}
+
+func (no NumberOperation) String() string {
+	return numberOperations[no]
+}

backend/v3/storage/database/repository/stmt/statement.go

@@ -0,0 +1,104 @@
+package stmt
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/zitadel/zitadel/backend/v3/storage/database"
+)
+
+type statement[T any] struct {
+	builder strings.Builder
+	client  database.QueryExecutor
+
+	columns []Column[T]
+
+	schema string
+	table  string
+	alias  string
+
+	condition Condition[T]
+
+	limit  uint32
+	offset uint32
+	// order by fieldname and sort direction false for asc true for desc
+	// orderBy SortingColumns[C]
+	args         []any
+	existingArgs map[any]string
+}
+
+func (s *statement[T]) scanners(t *T) []any {
+	scanners := make([]any, len(s.columns))
+	for i, column := range s.columns {
+		scanners[i] = column.scanner(t)
+	}
+	return scanners
+}
+
+func (s *statement[T]) query() string {
+	s.builder.WriteString(`SELECT `)
+	for i, column := range s.columns {
+		if i > 0 {
+			s.builder.WriteString(", ")
+		}
+		column.Apply(s)
+	}
+	s.builder.WriteString(` FROM `)
+	s.builder.WriteString(s.schema)
+	s.builder.WriteRune('.')
+	s.builder.WriteString(s.table)
+	if s.alias != "" {
+		s.builder.WriteString(" AS ")
+		s.builder.WriteString(s.alias)
+	}
+
+	s.builder.WriteString(` WHERE `)
+
+	s.condition.Apply(s)
+
+	if s.limit > 0 {
+		s.builder.WriteString(` LIMIT `)
+		s.builder.WriteString(s.appendArg(s.limit))
+	}
+	if s.offset > 0 {
+		s.builder.WriteString(` OFFSET `)
+		s.builder.WriteString(s.appendArg(s.offset))
+	}
+
+	return s.builder.String()
+}
+
+// func (s *statement[T]) Where(condition Condition[T]) *statement[T] {
+// 	s.condition = condition
+// 	return s
+// }
+
+// func (s *statement[T]) Limit(limit uint32) *statement[T] {
+// 	s.limit = limit
+// 	return s
+// }
+
+// func (s *statement[T]) Offset(offset uint32) *statement[T] {
+// 	s.offset = offset
+// 	return s
+// }
+
+func (s *statement[T]) columnPrefix() string {
+	if s.alias != "" {
+		return s.alias + "."
+	}
+	return s.schema + "." + s.table + "."
+}
+
+func (s *statement[T]) appendArg(arg any) string {
+	if s.existingArgs == nil {
+		s.existingArgs = make(map[any]string)
+	}
+	if existing, ok := s.existingArgs[arg]; ok {
+		return existing
+	}
+	s.args = append(s.args, arg)
+	placeholder := fmt.Sprintf("$%d", len(s.args))
+	s.existingArgs[arg] = placeholder
+	return placeholder
+}

backend/v3/storage/database/repository/stmt/stmt_test.go

@@ -0,0 +1,18 @@
+package stmt_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/zitadel/zitadel/backend/v3/storage/database/repository/stmt"
+)
+
+func Test_Bla(t *testing.T) {
+	stmt.User(nil).Where(
+		stmt.Or(
+			stmt.UserIDCondition("123"),
+			stmt.UserIDCondition("123"),
+			stmt.UserUsernameCondition(stmt.TextOperationEqualIgnoreCase, "test"),
+		),
+	).Limit(1).Offset(1).Get(context.Background())
+}

backend/v3/storage/database/repository/stmt/text.go

@@ -0,0 +1,72 @@
+package stmt
+
+type Text interface {
+	~string | ~[]byte
+}
+
+type TextCondition[V Text, T any] struct {
+	condition[V, T, TextOperation]
+}
+
+func (tc *TextCondition[V, T]) Apply(stmt *statement[T]) {
+	placeholder := stmt.appendArg(tc.value)
+
+	switch tc.op {
+	case TextOperationEqual, TextOperationNotEqual:
+		tc.field.Apply(stmt)
+		operation[T, TextOperation]{tc.op}.Apply(stmt)
+		stmt.builder.WriteString(placeholder)
+	case TextOperationEqualIgnoreCase:
+		if desc, ok := tc.field.(ignoreCaseColumnDescriptor[T]); ok {
+			desc.ApplyIgnoreCase(stmt)
+		} else {
+			stmt.builder.WriteString("LOWER(")
+			tc.field.Apply(stmt)
+			stmt.builder.WriteString(")")
+		}
+		operation[T, TextOperation]{tc.op}.Apply(stmt)
+		stmt.builder.WriteString("LOWER(")
+		stmt.builder.WriteString(placeholder)
+		stmt.builder.WriteString(")")
+	case TextOperationStartsWith:
+		tc.field.Apply(stmt)
+		operation[T, TextOperation]{tc.op}.Apply(stmt)
+		stmt.builder.WriteString(placeholder)
+		stmt.builder.WriteString("|| '%'")
+	case TextOperationStartsWithIgnoreCase:
+		if desc, ok := tc.field.(ignoreCaseColumnDescriptor[T]); ok {
+			desc.ApplyIgnoreCase(stmt)
+		} else {
+			stmt.builder.WriteString("LOWER(")
+			tc.field.Apply(stmt)
+			stmt.builder.WriteString(")")
+		}
+		operation[T, TextOperation]{tc.op}.Apply(stmt)
+		stmt.builder.WriteString("LOWER(")
+		stmt.builder.WriteString(placeholder)
+		stmt.builder.WriteString(")")
+		stmt.builder.WriteString("|| '%'")
+	}
+}
+
+type TextOperation uint8
+
+const (
+	TextOperationEqual TextOperation = iota + 1
+	TextOperationEqualIgnoreCase
+	TextOperationNotEqual
+	TextOperationStartsWith
+	TextOperationStartsWithIgnoreCase
+)
+
+var textOperations = map[TextOperation]string{
+	TextOperationEqual:                " = ",
+	TextOperationEqualIgnoreCase:      " = ",
+	TextOperationNotEqual:             " <> ",
+	TextOperationStartsWith:           " LIKE ",
+	TextOperationStartsWithIgnoreCase: " LIKE ",
+}
+
+func (to TextOperation) String() string {
+	return textOperations[to]
+}

backend/v3/storage/database/repository/stmt/user.go

@@ -0,0 +1,193 @@
+package stmt
+
+import (
+	"context"
+
+	"github.com/zitadel/zitadel/backend/v3/domain"
+	"github.com/zitadel/zitadel/backend/v3/storage/database"
+)
+
+type userStatement struct {
+	statement[domain.User]
+}
+
+func User(client database.QueryExecutor) *userStatement {
+	return &userStatement{
+		statement: statement[domain.User]{
+			schema: "zitadel",
+			table:  "users",
+			alias:  "u",
+			client: client,
+			columns: []Column[domain.User]{
+				userColumns[UserInstanceID],
+				userColumns[UserOrgID],
+				userColumns[UserColumnID],
+				userColumns[UserColumnUsername],
+				userColumns[UserCreatedAt],
+				userColumns[UserUpdatedAt],
+				userColumns[UserDeletedAt],
+			},
+		},
+	}
+}
+
+func (s *userStatement) Where(condition Condition[domain.User]) *userStatement {
+	s.condition = condition
+	return s
+}
+
+func (s *userStatement) Limit(limit uint32) *userStatement {
+	s.limit = limit
+	return s
+}
+
+func (s *userStatement) Offset(offset uint32) *userStatement {
+	s.offset = offset
+	return s
+}
+
+func (s *userStatement) Get(ctx context.Context) (*domain.User, error) {
+	var user domain.User
+	err := s.client.QueryRow(ctx, s.query(), s.statement.args...).Scan(s.scanners(&user)...)
+
+	if err != nil {
+		return nil, err
+	}
+
+	return &user, nil
+}
+
+func (s *userStatement) List(ctx context.Context) ([]*domain.User, error) {
+	var users []*domain.User
+	rows, err := s.client.Query(ctx, s.query(), s.statement.args...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var user domain.User
+		err = rows.Scan(s.scanners(&user)...)
+		if err != nil {
+			return nil, err
+		}
+		users = append(users, &user)
+	}
+
+	return users, nil
+}
+
+func (s *userStatement) SetUsername(ctx context.Context, username string) error {
+	return nil
+}
+
+type UserColumn uint8
+
+var (
+	userColumns map[UserColumn]Column[domain.User] = map[UserColumn]Column[domain.User]{
+		UserInstanceID: columnDescriptor[domain.User]{
+			name: "instance_id",
+			scan: func(u *domain.User) any {
+				return &u.InstanceID
+			},
+		},
+		UserOrgID: columnDescriptor[domain.User]{
+			name: "org_id",
+			scan: func(u *domain.User) any {
+				return &u.OrgID
+			},
+		},
+		UserColumnID: columnDescriptor[domain.User]{
+			name: "id",
+			scan: func(u *domain.User) any {
+				return &u.ID
+			},
+		},
+		UserColumnUsername: ignoreCaseColumnDescriptor[domain.User]{
+			columnDescriptor: columnDescriptor[domain.User]{
+				name: "username",
+				scan: func(u *domain.User) any {
+					return &u.Username
+				},
+			},
+			fieldNameSuffix: "_lower",
+		},
+		UserCreatedAt: columnDescriptor[domain.User]{
+			name: "created_at",
+			scan: func(u *domain.User) any {
+				return &u.CreatedAt
+			},
+		},
+		UserUpdatedAt: columnDescriptor[domain.User]{
+			name: "updated_at",
+			scan: func(u *domain.User) any {
+				return &u.UpdatedAt
+			},
+		},
+		UserDeletedAt: columnDescriptor[domain.User]{
+			name: "deleted_at",
+			scan: func(u *domain.User) any {
+				return &u.DeletedAt
+			},
+		},
+	}
+	humanColumns = map[UserColumn]Column[domain.User]{
+		UserHumanColumnEmail: ignoreCaseColumnDescriptor[domain.User]{
+			columnDescriptor: columnDescriptor[domain.User]{
+				name: "email",
+				scan: func(u *domain.User) any {
+					human, ok := u.Traits.(*domain.Human)
+					if !ok {
+						return nil
+					}
+					if human.Email == nil {
+						human.Email = new(domain.Email)
+					}
+					return &human.Email.Address
+				},
+			},
+			fieldNameSuffix: "_lower",
+		},
+		UserHumanColumnEmailVerified: columnDescriptor[domain.User]{
+			name: "email_is_verified",
+			scan: func(u *domain.User) any {
+				human, ok := u.Traits.(*domain.Human)
+				if !ok {
+					return nil
+				}
+				if human.Email == nil {
+					human.Email = new(domain.Email)
+				}
+				return &human.Email.IsVerified
+			},
+		},
+	}
+	machineColumns = map[UserColumn]Column[domain.User]{
+		UserMachineDescription: columnDescriptor[domain.User]{
+			name: "description",
+			scan: func(u *domain.User) any {
+				machine, ok := u.Traits.(*domain.Machine)
+				if !ok {
+					return nil
+				}
+				if machine == nil {
+					machine = new(domain.Machine)
+				}
+				return &machine.Description
+			},
+		},
+	}
+)
+
+const (
+	UserInstanceID UserColumn = iota + 1
+	UserOrgID
+	UserColumnID
+	UserColumnUsername
+	UserHumanColumnEmail
+	UserHumanColumnEmailVerified
+	UserMachineDescription
+	UserCreatedAt
+	UserUpdatedAt
+	UserDeletedAt
+)

backend/v3/storage/database/repository/stmt/user_condition.go

@@ -0,0 +1,23 @@
+package stmt
+
+import "github.com/zitadel/zitadel/backend/v3/domain"
+
+func UserIDCondition(id string) *TextCondition[string, domain.User] {
+	return &TextCondition[string, domain.User]{
+		condition: condition[string, domain.User, TextOperation]{
+			field: userColumns[UserColumnID],
+			op:    TextOperationEqual,
+			value: id,
+		},
+	}
+}
+
+func UserUsernameCondition(op TextOperation, username string) *TextCondition[string, domain.User] {
+	return &TextCondition[string, domain.User]{
+		condition: condition[string, domain.User, TextOperation]{
+			field: userColumns[UserColumnUsername],
+			op:    op,
+			value: username,
+		},
+	}
+}

backend/v3/storage/database/repository/stmt/v2/table.go

@@ -0,0 +1,135 @@
+package stmt
+
+// type table struct {
+// 	schema string
+// 	name   string
+
+// 	possibleJoins []*join
+
+// 	columns []*col
+// }
+
+// type col struct {
+// 	*table
+
+// 	name string
+// }
+
+// type join struct {
+// 	*table
+
+// 	on []*joinColumns
+// }
+
+// type joinColumns struct {
+// 	left, right *col
+// }
+
+// var (
+// 	userTable = &table{
+// 		schema: "zitadel",
+// 		name:   "users",
+// 	}
+// 	userColumns = []*col{
+// 		userInstanceIDColumn,
+// 		userOrgIDColumn,
+// 		userIDColumn,
+// 		userUsernameColumn,
+// 	}
+// 	userInstanceIDColumn = &col{
+// 		table: userTable,
+// 		name:  "instance_id",
+// 	}
+// 	userOrgIDColumn = &col{
+// 		table: userTable,
+// 		name:  "org_id",
+// 	}
+// 	userIDColumn = &col{
+// 		table: userTable,
+// 		name:  "id",
+// 	}
+// 	userUsernameColumn = &col{
+// 		table: userTable,
+// 		name:  "username",
+// 	}
+// 	userJoins = []*join{
+// 		{
+// 			table: instanceTable,
+// 			on: []*joinColumns{
+// 				{
+// 					left:  instanceIDColumn,
+// 					right: userInstanceIDColumn,
+// 				},
+// 			},
+// 		},
+// 		{
+// 			table: orgTable,
+// 			on: []*joinColumns{
+// 				{
+// 					left:  orgIDColumn,
+// 					right: userOrgIDColumn,
+// 				},
+// 			},
+// 		},
+// 	}
+// )
+
+// var (
+// 	instanceTable = &table{
+// 		schema: "zitadel",
+// 		name:   "instances",
+// 	}
+// 	instanceColumns = []*col{
+// 		instanceIDColumn,
+// 		instanceNameColumn,
+// 	}
+// 	instanceIDColumn = &col{
+// 		table: instanceTable,
+// 		name:  "id",
+// 	}
+// 	instanceNameColumn = &col{
+// 		table: instanceTable,
+// 		name:  "name",
+// 	}
+// )
+
+// var (
+// 	orgTable = &table{
+// 		schema: "zitadel",
+// 		name:   "orgs",
+// 	}
+// 	orgColumns = []*col{
+// 		orgInstanceIDColumn,
+// 		orgIDColumn,
+// 		orgNameColumn,
+// 	}
+// 	orgInstanceIDColumn = &col{
+// 		table: orgTable,
+// 		name:  "instance_id",
+// 	}
+// 	orgIDColumn = &col{
+// 		table: orgTable,
+// 		name:  "id",
+// 	}
+// 	orgNameColumn = &col{
+// 		table: orgTable,
+// 		name:  "name",
+// 	}
+// )
+
+// func init() {
+// 	instanceTable.columns = instanceColumns
+// 	userTable.columns = userColumns
+
+// 	userTable.possibleJoins = []join{
+// 		{
+// 			table: userTable,
+// 			on: []joinColumns{
+// 				{
+// 					left:  userIDColumn,
+// 					right: userIDColumn,
+// 				},
+// 			},
+// 		},
+// 	}
+// }

backend/v3/storage/database/repository/stmt/v3/column.go

@@ -0,0 +1,55 @@
+package v3
+
+type Column interface {
+	Name() string
+	Write(builder statementBuilder)
+}
+
+type ignoreCaseColumn interface {
+	Column
+	WriteIgnoreCase(builder statementBuilder)
+}
+
+var (
+	columnNameID        = "id"
+	columnNameName      = "name"
+	columnNameCreatedAt = "created_at"
+	columnNameUpdatedAt = "updated_at"
+	columnNameDeletedAt = "deleted_at"
+
+	columnNameInstanceID = "instance_id"
+
+	columnNameOrgID = "org_id"
+)
+
+type column struct {
+	table Table
+	name  string
+}
+
+// Write implements Column.
+func (c *column) Write(builder statementBuilder) {
+	c.table.writeOn(builder)
+	builder.writeRune('.')
+	builder.writeString(c.name)
+}
+
+// Name implements [Column].
+func (c *column) Name() string {
+	return c.name
+}
+
+var _ Column = (*column)(nil)
+
+type columnIgnoreCase struct {
+	column
+	suffix string
+}
+
+// WriteIgnoreCase implements ignoreCaseColumn.
+func (c *columnIgnoreCase) WriteIgnoreCase(builder statementBuilder) {
+	c.Write(builder)
+	builder.writeString(c.suffix)
+}
+
+var _ ignoreCaseColumn = (*columnIgnoreCase)(nil)

backend/v3/storage/database/repository/stmt/v3/condition.go

@@ -0,0 +1,182 @@
+package v3
+
+type statementBuilder interface {
+	write([]byte)
+	writeString(string)
+	writeRune(rune)
+
+	appendArg(any) (placeholder string)
+	table() Table
+}
+
+type Condition interface {
+	writeOn(builder statementBuilder)
+}
+
+type and struct {
+	conditions []Condition
+}
+
+func And(conditions ...Condition) *and {
+	return &and{conditions: conditions}
+}
+
+// writeOn implements [Condition].
+func (a *and) writeOn(builder statementBuilder) {
+	if len(a.conditions) > 1 {
+		builder.writeString("(")
+		defer builder.writeString(")")
+	}
+
+	for i, condition := range a.conditions {
+		if i > 0 {
+			builder.writeString(" AND ")
+		}
+		condition.writeOn(builder)
+	}
+}
+
+var _ Condition = (*and)(nil)
+
+type or struct {
+	conditions []Condition
+}
+
+func Or(conditions ...Condition) *or {
+	return &or{conditions: conditions}
+}
+
+// writeOn implements [Condition].
+func (o *or) writeOn(builder statementBuilder) {
+	if len(o.conditions) > 1 {
+		builder.writeString("(")
+		defer builder.writeString(")")
+	}
+
+	for i, condition := range o.conditions {
+		if i > 0 {
+			builder.writeString(" OR ")
+		}
+		condition.writeOn(builder)
+	}
+}
+
+var _ Condition = (*or)(nil)
+
+type isNull struct {
+	column Column
+}
+
+func IsNull(column Column) *isNull {
+	return &isNull{column: column}
+}
+
+// writeOn implements [Condition].
+func (cond *isNull) writeOn(builder statementBuilder) {
+	cond.column.Write(builder)
+	builder.writeString(" IS NULL")
+}
+
+var _ Condition = (*isNull)(nil)
+
+type isNotNull struct {
+	column Column
+}
+
+func IsNotNull(column Column) *isNotNull {
+	return &isNotNull{column: column}
+}
+
+// writeOn implements [Condition].
+func (cond *isNotNull) writeOn(builder statementBuilder) {
+	cond.column.Write(builder)
+	builder.writeString(" IS NOT NULL")
+}
+
+var _ Condition = (*isNotNull)(nil)
+
+type condition[Op Operator, V Value] struct {
+	column   Column
+	operator Op
+	value    V
+}
+
+// writeOn implements [Condition].
+func (cond condition[Op, V]) writeOn(builder statementBuilder) {
+	cond.column.Write(builder)
+	builder.writeString(cond.operator.String())
+	builder.writeString(builder.appendArg(cond.value))
+}
+
+var _ Condition = (*condition[TextOperator, string])(nil)
+
+type textCondition[V Text] struct {
+	condition[TextOperator, V]
+}
+
+func NewTextCondition[V Text](column Column, operator TextOperator, value V) *textCondition[V] {
+	return &textCondition[V]{
+		condition: condition[TextOperator, V]{
+			column:   column,
+			operator: operator,
+			value:    value,
+		},
+	}
+}
+
+// writeOn implements [Condition].
+func (cond *textCondition[V]) writeOn(builder statementBuilder) {
+	switch cond.operator {
+	case TextOperatorEqual, TextOperatorNotEqual:
+		cond.column.Write(builder)
+		builder.writeString(cond.operator.String())
+		builder.writeString(builder.appendArg(cond.value))
+	case TextOperatorEqualIgnoreCase, TextOperatorNotEqualIgnoreCase:
+		if col, ok := cond.column.(ignoreCaseColumn); ok {
+			col.WriteIgnoreCase(builder)
+		} else {
+			builder.writeString("LOWER(")
+			cond.column.Write(builder)
+			builder.writeString(")")
+		}
+		builder.writeString(cond.operator.String())
+		builder.writeString("LOWER(")
+		builder.writeString(builder.appendArg(cond.value))
+		builder.writeString(")")
+	case TextOperatorStartsWith:
+		cond.column.Write(builder)
+		builder.writeString(cond.operator.String())
+		builder.writeString(builder.appendArg(cond.value))
+		builder.writeString(" || '%'")
+	case TextOperatorStartsWithIgnoreCase:
+		if col, ok := cond.column.(ignoreCaseColumn); ok {
+			col.WriteIgnoreCase(builder)
+		} else {
+			builder.writeString("LOWER(")
+			cond.column.Write(builder)
+			builder.writeString(")")
+		}
+		builder.writeString(cond.operator.String())
+		builder.writeString("LOWER(")
+		builder.writeString(builder.appendArg(cond.value))
+		builder.writeString(") || '%'")
+	}
+}
+
+var _ Condition = (*textCondition[string])(nil)
+
+type numberCondition[V Number] struct {
+	condition[NumberOperator, V]
+}
+
+func NewNumberCondition[V Number](column Column, operator NumberOperator, value V) *numberCondition[V] {
+	return &numberCondition[V]{
+		condition: condition[NumberOperator, V]{
+			column:   column,
+			operator: operator,
+			value:    value,
+		},
+	}
+}
+
+var _ Condition = (*numberCondition[int])(nil)

backend/v3/storage/database/repository/stmt/v3/instance.go

@@ -0,0 +1,104 @@
+package v3
+
+import (
+	"time"
+
+	"github.com/zitadel/zitadel/backend/v3/storage/database"
+)
+
+type Instance struct {
+	id   string
+	name string
+
+	createdAt time.Time
+	updatedAt time.Time
+	deletedAt time.Time
+}
+
+// Columns implements [object].
+func (Instance) Columns(table Table) []Column {
+	return []Column{
+		&column{
+			table: table,
+			name:  columnNameID,
+		},
+		&column{
+			table: table,
+			name:  columnNameName,
+		},
+		&column{
+			table: table,
+			name:  columnNameCreatedAt,
+		},
+		&column{
+			table: table,
+			name:  columnNameUpdatedAt,
+		},
+		&column{
+			table: table,
+			name:  columnNameDeletedAt,
+		},
+	}
+}
+
+// Scan implements [object].
+func (i Instance) Scan(row database.Scanner) error {
+	return row.Scan(
+		&i.id,
+		&i.name,
+		&i.createdAt,
+		&i.updatedAt,
+		&i.deletedAt,
+	)
+}
+
+type instanceTable struct {
+	*table
+}
+
+func InstanceTable() *instanceTable {
+	table := &instanceTable{
+		table: newTable[Instance]("zitadel", "instances"),
+	}
+
+	table.possibleJoins = func(t Table) map[string]Column {
+		switch on := t.(type) {
+		case *instanceTable:
+			return map[string]Column{
+				columnNameID: on.IDColumn(),
+			}
+		case *orgTable:
+			return map[string]Column{
+				columnNameID: on.InstanceIDColumn(),
+			}
+		case *userTable:
+			return map[string]Column{
+				columnNameID: on.InstanceIDColumn(),
+			}
+		default:
+			return nil
+		}
+	}
+
+	return table
+}
+
+func (i *instanceTable) IDColumn() Column {
+	return i.columns[columnNameID]
+}
+
+func (i *instanceTable) NameColumn() Column {
+	return i.columns[columnNameName]
+}
+
+func (i *instanceTable) CreatedAtColumn() Column {
+	return i.columns[columnNameCreatedAt]
+}
+
+func (i *instanceTable) UpdatedAtColumn() Column {
+	return i.columns[columnNameUpdatedAt]
+}
+
+func (i *instanceTable) DeletedAtColumn() Column {
+	return i.columns[columnNameDeletedAt]
+}

backend/v3/storage/database/repository/stmt/v3/join.go

@@ -0,0 +1,11 @@
+package v3
+
+type join struct {
+	table      Table
+	conditions []joinCondition
+}
+
+type joinCondition struct {
+	left  Column
+	right Column
+}

backend/v3/storage/database/repository/stmt/v3/operator.go

@@ -0,0 +1,82 @@
+package v3
+
+import (
+	"fmt"
+	"time"
+
+	"golang.org/x/exp/constraints"
+)
+
+type Value interface {
+	Bool | Number | Text
+}
+
+type Text interface {
+	~string | ~[]byte
+}
+
+type Number interface {
+	constraints.Integer | constraints.Float | constraints.Complex | time.Time | time.Duration
+}
+
+type Bool interface {
+	~bool
+}
+
+type Operator interface {
+	fmt.Stringer
+}
+
+type TextOperator uint8
+
+// String implements [Operator].
+func (t TextOperator) String() string {
+	return textOperators[t]
+}
+
+const (
+	TextOperatorEqual TextOperator = iota + 1
+	TextOperatorEqualIgnoreCase
+	TextOperatorNotEqual
+	TextOperatorNotEqualIgnoreCase
+	TextOperatorStartsWith
+	TextOperatorStartsWithIgnoreCase
+)
+
+var textOperators = map[TextOperator]string{
+	TextOperatorEqual:                " = ",
+	TextOperatorEqualIgnoreCase:      " LIKE ",
+	TextOperatorNotEqual:             " <> ",
+	TextOperatorNotEqualIgnoreCase:   " NOT LIKE ",
+	TextOperatorStartsWith:           " LIKE ",
+	TextOperatorStartsWithIgnoreCase: " LIKE ",
+}
+
+var _ Operator = TextOperator(0)
+
+type NumberOperator uint8
+
+// String implements Operator.
+func (n NumberOperator) String() string {
+	return numberOperators[n]
+}
+
+const (
+	NumberOperatorEqual NumberOperator = iota + 1
+	NumberOperatorNotEqual
+	NumberOperatorLessThan
+	NumberOperatorLessThanOrEqual
+	NumberOperatorGreaterThan
+	NumberOperatorGreaterThanOrEqual
+)
+
+var numberOperators = map[NumberOperator]string{
+	NumberOperatorEqual:              " = ",
+	NumberOperatorNotEqual:           " <> ",
+	NumberOperatorLessThan:           " < ",
+	NumberOperatorLessThanOrEqual:    " <= ",
+	NumberOperatorGreaterThan:        " > ",
+	NumberOperatorGreaterThanOrEqual: " >= ",
+}
+
+var _ Operator = NumberOperator(0)

backend/v3/storage/database/repository/stmt/v3/org.go

@@ -0,0 +1,117 @@
+package v3
+
+import (
+	"time"
+
+	"github.com/zitadel/zitadel/backend/v3/storage/database"
+)
+
+type Org struct {
+	instanceID string
+	id         string
+
+	name string
+
+	createdAt time.Time
+	updatedAt time.Time
+	deletedAt time.Time
+}
+
+// Columns implements [object].
+func (Org) Columns(table Table) []Column {
+	return []Column{
+		&column{
+			table: table,
+			name:  columnNameInstanceID,
+		},
+		&column{
+			table: table,
+			name:  columnNameID,
+		},
+		&column{
+			table: table,
+			name:  columnNameName,
+		},
+		&column{
+			table: table,
+			name:  columnNameCreatedAt,
+		},
+		&column{
+			table: table,
+			name:  columnNameUpdatedAt,
+		},
+		&column{
+			table: table,
+			name:  columnNameDeletedAt,
+		},
+	}
+}
+
+// Scan implements [object].
+func (o Org) Scan(row database.Scanner) error {
+	return row.Scan(
+		&o.instanceID,
+		&o.id,
+		&o.name,
+		&o.createdAt,
+		&o.updatedAt,
+		&o.deletedAt,
+	)
+}
+
+type orgTable struct {
+	*table
+}
+
+func OrgTable() *orgTable {
+	table := &orgTable{
+		table: newTable[Org]("zitadel", "orgs"),
+	}
+
+	table.possibleJoins = func(table Table) map[string]Column {
+		switch on := table.(type) {
+		case *instanceTable:
+			return map[string]Column{
+				columnNameInstanceID: on.IDColumn(),
+			}
+		case *orgTable:
+			return map[string]Column{
+				columnNameInstanceID: on.InstanceIDColumn(),
+				columnNameID:         on.IDColumn(),
+			}
+		case *userTable:
+			return map[string]Column{
+				columnNameInstanceID: on.InstanceIDColumn(),
+				columnNameID:         on.IDColumn(),
+			}
+		default:
+			return nil
+		}
+	}
+
+	return table
+}
+
+func (o *orgTable) InstanceIDColumn() Column {
+	return o.columns[columnNameInstanceID]
+}
+
+func (o *orgTable) IDColumn() Column {
+	return o.columns[columnNameID]
+}
+
+func (o *orgTable) NameColumn() Column {
+	return o.columns[columnNameName]
+}
+
+func (o *orgTable) CreatedAtColumn() Column {
+	return o.columns[columnNameCreatedAt]
+}
+
+func (o *orgTable) UpdatedAtColumn() Column {
+	return o.columns[columnNameUpdatedAt]
+}
+
+func (o *orgTable) DeletedAtColumn() Column {
+	return o.columns[columnNameDeletedAt]
+}

backend/v3/storage/database/repository/stmt/v3/query.go

@@ -0,0 +1,188 @@
+package v3
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/zitadel/zitadel/backend/v3/storage/database"
+)
+
+type Query[O object] interface {
+	Where(condition Condition)
+	Join(tables ...Table)
+	Limit(limit uint32)
+	Offset(offset uint32)
+	OrderBy(columns ...Column)
+
+	Result(ctx context.Context, client database.Querier) (*O, error)
+	Results(ctx context.Context, client database.Querier) ([]O, error)
+
+	fmt.Stringer
+	statementBuilder
+}
+
+type query[O object] struct {
+	*statement[O]
+	joins   []join
+	limit   uint32
+	offset  uint32
+	orderBy []Column
+}
+
+func NewQuery[O object](table Table) Query[O] {
+	return &query[O]{
+		statement: newStatement[O](table),
+	}
+}
+
+// Result implements [Query].
+func (q *query[O]) Result(ctx context.Context, client database.Querier) (*O, error) {
+	var object O
+	row := client.QueryRow(ctx, q.String(), q.args...)
+	if err := object.Scan(row); err != nil {
+		return nil, err
+	}
+	return &object, nil
+}
+
+// Results implements [Query].
+func (q *query[O]) Results(ctx context.Context, client database.Querier) ([]O, error) {
+	var objects []O
+	rows, err := client.Query(ctx, q.String(), q.args...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var object O
+		if err := object.Scan(rows); err != nil {
+			return nil, err
+		}
+		objects = append(objects, object)
+	}
+
+	return objects, rows.Err()
+}
+
+// Join implements [Query].
+func (q *query[O]) Join(tables ...Table) {
+	for _, tbl := range tables {
+		cols := q.tbl.(*table).possibleJoins(tbl)
+		if len(cols) == 0 {
+			panic(fmt.Sprintf("table %q does not have any possible joins with table %q", q.tbl.Name(), tbl.Name()))
+		}
+
+		q.joins = append(q.joins, join{
+			table:      tbl,
+			conditions: make([]joinCondition, 0, len(cols)),
+		})
+
+		for colName, col := range cols {
+			q.joins[len(q.joins)-1].conditions = append(q.joins[len(q.joins)-1].conditions, joinCondition{
+				left:  q.tbl.(*table).columns[colName],
+				right: col,
+			})
+		}
+	}
+}
+
+func (q *query[O]) Limit(limit uint32) {
+	q.limit = limit
+}
+
+func (q *query[O]) Offset(offset uint32) {
+	q.offset = offset
+}
+
+func (q *query[O]) OrderBy(columns ...Column) {
+	for _, allowedColumn := range q.columns {
+		for _, column := range columns {
+			if allowedColumn.Name() == column.Name() {
+				q.orderBy = append(q.orderBy, column)
+			}
+		}
+	}
+}
+
+// String implements [fmt.Stringer] and [Query].
+func (q *query[O]) String() string {
+	q.writeSelectColumns()
+	q.writeFrom()
+	q.writeJoins()
+	q.writeCondition()
+	q.writeOrderBy()
+	q.writeLimit()
+	q.writeOffset()
+	q.writeGroupBy()
+	return q.builder.String()
+}
+
+func (q *query[O]) writeSelectColumns() {
+	q.builder.WriteString("SELECT ")
+	for i, column := range q.columns {
+		if i > 0 {
+			q.builder.WriteString(", ")
+		}
+		q.builder.WriteString(q.tbl.Alias())
+		q.builder.WriteRune('.')
+		q.builder.WriteString(column.Name())
+	}
+}
+
+func (q *query[O]) writeJoins() {
+	for _, join := range q.joins {
+		q.builder.WriteString(" JOIN ")
+		q.builder.WriteString(join.table.Schema())
+		q.builder.WriteRune('.')
+		q.builder.WriteString(join.table.Name())
+		if join.table.Alias() != "" {
+			q.builder.WriteString(" AS ")
+			q.builder.WriteString(join.table.Alias())
+		}
+
+		q.builder.WriteString(" ON ")
+		for i, condition := range join.conditions {
+			if i > 0 {
+				q.builder.WriteString(" AND ")
+			}
+			q.builder.WriteString(condition.left.Name())
+			q.builder.WriteString(" = ")
+			q.builder.WriteString(condition.right.Name())
+		}
+	}
+}
+
+func (q *query[O]) writeOrderBy() {
+	if len(q.orderBy) == 0 {
+		return
+	}
+
+	q.builder.WriteString(" ORDER BY ")
+	for i, order := range q.orderBy {
+		if i > 0 {
+			q.builder.WriteString(", ")
+		}
+		order.Write(q)
+	}
+}
+
+func (q *query[O]) writeLimit() {
+	if q.limit == 0 {
+		return
+	}
+	q.builder.WriteString(" LIMIT ")
+	q.builder.WriteString(q.appendArg(q.limit))
+}
+
+func (q *query[O]) writeOffset() {
+	if q.offset == 0 {
+		return
+	}
+	q.builder.WriteString(" OFFSET ")
+	q.builder.WriteString(q.appendArg(q.offset))
+}
+
+func (q *query[O]) writeGroupBy() {
+	q.builder.WriteString(" GROUP BY ")
+}

backend/v3/storage/database/repository/stmt/v3/statement.go

@@ -0,0 +1,85 @@
+package v3
+
+import (
+	"fmt"
+	"strings"
+)
+
+type statement[T object] struct {
+	tbl       Table
+	columns   []Column
+	condition Condition
+
+	builder      strings.Builder
+	args         []any
+	existingArgs map[any]string
+}
+
+func newStatement[O object](t Table) *statement[O] {
+	var o O
+	return &statement[O]{
+		tbl:     t,
+		columns: o.Columns(t),
+	}
+}
+
+// Where implements [Query].
+func (stmt *statement[T]) Where(condition Condition) {
+	stmt.condition = condition
+}
+
+func (stmt *statement[T]) writeFrom() {
+	stmt.builder.WriteString(" FROM ")
+	stmt.builder.WriteString(stmt.tbl.Schema())
+	stmt.builder.WriteRune('.')
+	stmt.builder.WriteString(stmt.tbl.Name())
+	if stmt.tbl.Alias() != "" {
+		stmt.builder.WriteString(" AS ")
+		stmt.builder.WriteString(stmt.tbl.Alias())
+	}
+}
+
+func (stmt *statement[T]) writeCondition() {
+	if stmt.condition == nil {
+		return
+	}
+	stmt.builder.WriteString(" WHERE ")
+	stmt.condition.writeOn(stmt)
+}
+
+// appendArg implements [statementBuilder].
+func (stmt *statement[T]) appendArg(arg any) (placeholder string) {
+	if stmt.existingArgs == nil {
+		stmt.existingArgs = make(map[any]string)
+	}
+	if placeholder, ok := stmt.existingArgs[arg]; ok {
+		return placeholder
+	}
+
+	stmt.args = append(stmt.args, arg)
+	placeholder = fmt.Sprintf("$%d", len(stmt.args))
+	stmt.existingArgs[arg] = placeholder
+	return placeholder
+}
+
+// table implements [statementBuilder].
+func (stmt *statement[T]) table() Table {
+	return stmt.tbl
+}
+
+// write implements [statementBuilder].
+func (stmt *statement[T]) write(data []byte) {
+	stmt.builder.Write(data)
+}
+
+// writeRune implements [statementBuilder].
+func (stmt *statement[T]) writeRune(r rune) {
+	stmt.builder.WriteRune(r)
+}
+
+// writeString implements [statementBuilder].
+func (stmt *statement[T]) writeString(s string) {
+	stmt.builder.WriteString(s)
+}
+
+var _ statementBuilder = (*statement[Instance])(nil)

backend/v3/storage/database/repository/stmt/v3/table.go

@@ -0,0 +1,84 @@
+package v3
+
+import "github.com/zitadel/zitadel/backend/v3/storage/database"
+
+type object interface {
+	User | Org | Instance
+	Columns(t Table) []Column
+	Scan(s database.Scanner) error
+}
+
+type Table interface {
+	Schema() string
+	Name() string
+	Alias() string
+	Columns() []Column
+
+	writeOn(builder statementBuilder)
+}
+
+type table struct {
+	schema string
+	name   string
+	alias  string
+
+	possibleJoins func(table Table) map[string]Column
+
+	columns map[string]Column
+	colList []Column
+}
+
+func newTable[O object](schema, name string) *table {
+	t := &table{
+		schema: schema,
+		name:   name,
+	}
+
+	var o O
+	t.colList = o.Columns(t)
+	t.columns = make(map[string]Column, len(t.colList))
+	for _, col := range t.colList {
+		t.columns[col.Name()] = col
+	}
+
+	return t
+}
+
+// Columns implements [Table].
+func (t *table) Columns() []Column {
+	if len(t.colList) > 0 {
+		return t.colList
+	}
+
+	t.colList = make([]Column, 0, len(t.columns))
+	for _, column := range t.columns {
+		t.colList = append(t.colList, column)
+	}
+
+	return t.colList
+}
+
+// Name implements [Table].
+func (t *table) Name() string {
+	return t.name
+}
+
+// Schema implements [Table].
+func (t *table) Schema() string {
+	return t.schema
+}
+
+// Alias implements [Table].
+func (t *table) Alias() string {
+	if t.alias != "" {
+		return t.alias
+	}
+	return t.schema + "." + t.name
+}
+
+// writeOn implements [Table].
+func (t *table) writeOn(builder statementBuilder) {
+	builder.writeString(t.Alias())
+}
+
+var _ Table = (*table)(nil)

backend/v3/storage/database/repository/stmt/v3/user.go

@@ -0,0 +1,170 @@
+package v3
+
+import (
+	"time"
+
+	"github.com/zitadel/zitadel/backend/v3/storage/database"
+)
+
+type User struct {
+	instanceID string
+	orgID      string
+	id         string
+	username   string
+
+	createdAt time.Time
+	updatedAt time.Time
+	deletedAt time.Time
+}
+
+// Columns implements [object].
+func (u User) Columns(table Table) []Column {
+	return []Column{
+		&column{
+			table: table,
+			name:  columnNameInstanceID,
+		},
+		&column{
+			table: table,
+			name:  columnNameOrgID,
+		},
+		&column{
+			table: table,
+			name:  columnNameID,
+		},
+		&columnIgnoreCase{
+			column: column{
+				table: table,
+				name:  userTableUsernameColumn,
+			},
+			suffix: "_lower",
+		},
+		&column{
+			table: table,
+			name:  columnNameCreatedAt,
+		},
+		&column{
+			table: table,
+			name:  columnNameUpdatedAt,
+		},
+		&column{
+			table: table,
+			name:  columnNameDeletedAt,
+		},
+	}
+}
+
+// Scan implements [object].
+func (u User) Scan(row database.Scanner) error {
+	return row.Scan(
+		&u.instanceID,
+		&u.orgID,
+		&u.id,
+		&u.username,
+		&u.createdAt,
+		&u.updatedAt,
+		&u.deletedAt,
+	)
+}
+
+type userTable struct {
+	*table
+}
+
+const (
+	userTableUsernameColumn = "username"
+)
+
+func UserTable() *userTable {
+	table := &userTable{
+		table: newTable[User]("zitadel", "users"),
+	}
+
+	table.possibleJoins = func(table Table) map[string]Column {
+		switch on := table.(type) {
+		case *userTable:
+			return map[string]Column{
+				columnNameInstanceID: on.InstanceIDColumn(),
+				columnNameOrgID:      on.OrgIDColumn(),
+				columnNameID:         on.IDColumn(),
+			}
+		case *orgTable:
+			return map[string]Column{
+				columnNameInstanceID: on.InstanceIDColumn(),
+				columnNameOrgID:      on.IDColumn(),
+			}
+		case *instanceTable:
+			return map[string]Column{
+				columnNameInstanceID: on.IDColumn(),
+			}
+		default:
+			return nil
+		}
+	}
+
+	return table
+}
+
+func (t *userTable) InstanceIDColumn() Column {
+	return t.columns[columnNameInstanceID]
+}
+
+func (t *userTable) OrgIDColumn() Column {
+	return t.columns[columnNameOrgID]
+}
+
+func (t *userTable) IDColumn() Column {
+	return t.columns[columnNameID]
+}
+
+func (t *userTable) UsernameColumn() Column {
+	return t.columns[userTableUsernameColumn]
+}
+
+func (t *userTable) CreatedAtColumn() Column {
+	return t.columns[columnNameCreatedAt]
+}
+
+func (t *userTable) UpdatedAtColumn() Column {
+	return t.columns[columnNameUpdatedAt]
+}
+
+func (t *userTable) DeletedAtColumn() Column {
+	return t.columns[columnNameDeletedAt]
+}
+
+func NewUserQuery() Query[User] {
+	q := NewQuery[User](UserTable())
+	return q
+}
+
+type userByIDCondition[T Text] struct {
+	id T
+}
+
+func UserByID[T Text](id T) Condition {
+	return &userByIDCondition[T]{id: id}
+}
+
+// writeOn implements Condition.
+func (u *userByIDCondition[T]) writeOn(builder statementBuilder) {
+	NewTextCondition(builder.table().(*userTable).IDColumn(), TextOperatorEqual, u.id).writeOn(builder)
+}
+
+var _ Condition = (*userByIDCondition[string])(nil)
+
+type userByUsernameCondition[T Text] struct {
+	username T
+	operator TextOperator
+}
+
+func UserByUsername[T Text](username T, operator TextOperator) Condition {
+	return &userByUsernameCondition[T]{username: username, operator: operator}
+}
+
+// writeOn implements Condition.
+func (u *userByUsernameCondition[T]) writeOn(builder statementBuilder) {
+	NewTextCondition(builder.table().(*userTable).UsernameColumn(), u.operator, u.username).writeOn(builder)
+}
+
+var _ Condition = (*userByUsernameCondition[string])(nil)

backend/v3/storage/database/repository/stmt/v3/user_test.go

@@ -0,0 +1,25 @@
+package v3_test
+
+import (
+	"context"
+	"testing"
+
+	v3 "github.com/zitadel/zitadel/backend/v3/storage/database/repository/stmt/v3"
+)
+
+type user struct{}
+
+func TestUser(t *testing.T) {
+	query := v3.NewUserQuery()
+	query.Where(
+		v3.Or(
+			v3.UserByID("123"),
+			v3.UserByUsername("test", v3.TextOperatorStartsWithIgnoreCase),
+		),
+	)
+	query.Limit(10)
+	query.Offset(5)
+	// query.OrderBy(
+
+	query.Result(context.TODO(), nil)
+}

backend/v3/storage/database/repository/stmt/v4/column.go

@@ -0,0 +1,78 @@
+package v4
+
+type Change interface {
+	Column
+}
+
+type change[V Value] struct {
+	column Column
+	value  V
+}
+
+func newChange[V Value](col Column, value V) Change {
+	return &change[V]{
+		column: col,
+		value:  value,
+	}
+}
+
+func newUpdatePtrColumn[V Value](col Column, value *V) Change {
+	if value == nil {
+		return newChange(col, nullDBInstruction)
+	}
+	return newChange(col, *value)
+}
+
+// writeTo implements [Change].
+func (c change[V]) writeTo(builder *statementBuilder) {
+	c.column.writeTo(builder)
+	builder.WriteString(" = ")
+	builder.writeArg(c.value)
+}
+
+type Changes []Change
+
+func newChanges(cols ...Change) Change {
+	return Changes(cols)
+}
+
+// writeTo implements [Change].
+func (m Changes) writeTo(builder *statementBuilder) {
+	for i, col := range m {
+		if i > 0 {
+			builder.WriteString(", ")
+		}
+		col.writeTo(builder)
+	}
+}
+
+var _ Change = Changes(nil)
+
+var _ Change = (*change[string])(nil)
+
+type Column interface {
+	writeTo(builder *statementBuilder)
+}
+
+type column struct {
+	name string
+}
+
+func (c column) writeTo(builder *statementBuilder) {
+	builder.WriteString(c.name)
+}
+
+type ignoreCaseColumn interface {
+	Column
+	writeIgnoreCaseTo(builder *statementBuilder)
+}
+
+type ignoreCaseCol struct {
+	column
+	suffix string
+}
+
+func (c ignoreCaseCol) writeIgnoreCaseTo(builder *statementBuilder) {
+	c.column.writeTo(builder)
+	builder.WriteString(c.suffix)
+}

backend/v3/storage/database/repository/stmt/v4/condition.go

@@ -0,0 +1,112 @@
+package v4
+
+type Condition interface {
+	writeTo(builder *statementBuilder)
+}
+
+type and struct {
+	conditions []Condition
+}
+
+// writeTo implements [Condition].
+func (a *and) writeTo(builder *statementBuilder) {
+	if len(a.conditions) > 1 {
+		builder.WriteString("(")
+		defer builder.WriteString(")")
+	}
+	for i, condition := range a.conditions {
+		if i > 0 {
+			builder.WriteString(" AND ")
+		}
+		condition.writeTo(builder)
+	}
+}
+
+func And(conditions ...Condition) *and {
+	return &and{conditions: conditions}
+}
+
+var _ Condition = (*and)(nil)
+
+type or struct {
+	conditions []Condition
+}
+
+// writeTo implements [Condition].
+func (o *or) writeTo(builder *statementBuilder) {
+	if len(o.conditions) > 1 {
+		builder.WriteString("(")
+		defer builder.WriteString(")")
+	}
+	for i, condition := range o.conditions {
+		if i > 0 {
+			builder.WriteString(" OR ")
+		}
+		condition.writeTo(builder)
+	}
+}
+
+func Or(conditions ...Condition) *or {
+	return &or{conditions: conditions}
+}
+
+var _ Condition = (*or)(nil)
+
+type isNull struct {
+	column Column
+}
+
+// writeTo implements [Condition].
+func (i *isNull) writeTo(builder *statementBuilder) {
+	i.column.writeTo(builder)
+	builder.WriteString(" IS NULL")
+}
+
+func IsNull(column Column) *isNull {
+	return &isNull{column: column}
+}
+
+var _ Condition = (*isNull)(nil)
+
+type isNotNull struct {
+	column Column
+}
+
+// writeTo implements [Condition].
+func (i *isNotNull) writeTo(builder *statementBuilder) {
+	i.column.writeTo(builder)
+	builder.WriteString(" IS NOT NULL")
+}
+
+func IsNotNull(column Column) *isNotNull {
+	return &isNotNull{column: column}
+}
+
+var _ Condition = (*isNotNull)(nil)
+
+type valueCondition func(builder *statementBuilder)
+
+func newTextCondition[V Text](col Column, op TextOperator, value V) Condition {
+	return valueCondition(func(builder *statementBuilder) {
+		writeTextOperation(builder, col, op, value)
+	})
+}
+
+func newNumberCondition[V Number](col Column, op NumberOperator, value V) Condition {
+	return valueCondition(func(builder *statementBuilder) {
+		writeNumberOperation(builder, col, op, value)
+	})
+}
+
+func newBooleanCondition[V Boolean](col Column, value V) Condition {
+	return valueCondition(func(builder *statementBuilder) {
+		writeBooleanOperation(builder, col, value)
+	})
+}
+
+// writeTo implements [Condition].
+func (c valueCondition) writeTo(builder *statementBuilder) {
+	c(builder)
+}
+
+var _ Condition = (*valueCondition)(nil)

backend/v3/storage/database/repository/stmt/v4/doc.go

@@ -0,0 +1,2 @@
+// this test focuses on queries rather than on tables
+package v4

backend/v3/storage/database/repository/stmt/v4/inheritance.sql

@@ -0,0 +1,149 @@
+CREATE TABLE objects (
+    id SERIAL PRIMARY KEY,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL,
+    deleted_at TIMESTAMP
+);
+
+CREATE OR REPLACE FUNCTION update_updated_at_column()
+RETURNS TRIGGER AS $$
+BEGIN
+   NEW.updated_at = NOW();
+   RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TABLE instances(
+    name VARCHAR(50) NOT NULL
+    , PRIMARY KEY (id)
+) INHERITS (objects);
+
+CREATE TRIGGER set_updated_at
+BEFORE UPDATE
+ON instances
+FOR EACH ROW
+EXECUTE FUNCTION update_updated_at_column();
+
+CREATE TABLE instance_objects(
+    instance_id INT NOT NULL
+    , PRIMARY KEY (instance_id, id)
+    -- as foreign keys are not inherited we need to define them on the child tables
+    --, CONSTRAINT fk_instance FOREIGN KEY (instance_id) REFERENCES instances(id)
+) INHERITS (objects);
+
+CREATE TABLE orgs(
+    name VARCHAR(50) NOT NULL
+    , PRIMARY KEY (instance_id, id)
+    , CONSTRAINT fk_instance FOREIGN KEY (instance_id) REFERENCES instances(id)
+) INHERITS (instance_objects);
+
+CREATE TRIGGER set_updated_at
+BEFORE UPDATE
+ON orgs
+FOR EACH ROW
+EXECUTE FUNCTION update_updated_at_column();
+
+CREATE TABLE org_objects(
+    org_id INT NOT NULL
+    , PRIMARY KEY (instance_id, org_id, id)
+    -- as foreign keys are not inherited we need to define them on the child tables
+    -- CONSTRAINT fk_org FOREIGN KEY (instance_id, org_id) REFERENCES orgs(instance_id, id),
+    -- CONSTRAINT fk_instance FOREIGN KEY (instance_id) REFERENCES instances(id)
+) INHERITS (instance_objects);
+
+CREATE TABLE users (
+    username VARCHAR(50) NOT NULL
+    , PRIMARY KEY (instance_id, org_id, id)
+    -- as foreign keys are not inherited we need to define them on the child tables
+    -- , CONSTRAINT fk_org FOREIGN KEY (instance_id, org_id) REFERENCES orgs(instance_id, id)
+    -- , CONSTRAINT fk_instances FOREIGN KEY (instance_id) REFERENCES instances(id)
+) INHERITS (org_objects);
+
+CREATE TRIGGER set_updated_at
+BEFORE UPDATE
+ON users
+FOR EACH ROW
+EXECUTE FUNCTION update_updated_at_column();
+
+CREATE TABLE human_users(
+    first_name VARCHAR(50)
+    , last_name VARCHAR(50)
+    , PRIMARY KEY (instance_id, org_id, id)
+    -- CONSTRAINT fk_user FOREIGN KEY (instance_id, org_id, id) REFERENCES users(instance_id, org_id, id),
+    , CONSTRAINT fk_org FOREIGN KEY (instance_id, org_id) REFERENCES orgs(instance_id, id)
+    , CONSTRAINT fk_instances FOREIGN KEY (instance_id) REFERENCES instances(id)
+) INHERITS (users);
+
+CREATE TRIGGER set_updated_at
+BEFORE UPDATE
+ON human_users
+FOR EACH ROW
+EXECUTE FUNCTION update_updated_at_column();
+
+CREATE TABLE machine_users(
+    description VARCHAR(50)
+    , PRIMARY KEY (instance_id, org_id, id)
+    -- , CONSTRAINT fk_user FOREIGN KEY (instance_id, org_id, id) REFERENCES users(instance_id, org_id, id)
+    , CONSTRAINT fk_org FOREIGN KEY (instance_id, org_id) REFERENCES orgs(instance_id, id)
+    , CONSTRAINT fk_instances FOREIGN KEY (instance_id) REFERENCES instances(id)
+) INHERITS (users);
+
+CREATE TRIGGER set_updated_at
+BEFORE UPDATE
+ON machine_users
+FOR EACH ROW
+EXECUTE FUNCTION update_updated_at_column();
+
+
+select u.*, hu.first_name, hu.last_name, mu.description from users u
+left join human_users hu on u.instance_id = hu.instance_id and u.org_id = hu.org_id and u.id = hu.id
+left join machine_users mu on u.instance_id = mu.instance_id and u.org_id = mu.org_id and u.id = mu.id
+-- where
+--     u.instance_id = 1
+--     and u.org_id = 3
+--     and u.id = 7
+;
+
+create view users_view as (
+SELECT 
+    id
+    , created_at
+    , updated_at
+    , deleted_at
+    , instance_id
+    , org_id
+    , username
+    , first_name
+    , last_name
+    , description 
+FROM (
+(SELECT 
+    id
+    , created_at
+    , updated_at
+    , deleted_at
+    , instance_id
+    , org_id
+    , username
+    , first_name
+    , last_name
+    , NULL AS description 
+FROM
+    human_users)
+
+UNION
+
+(SELECT 
+    id
+    , created_at
+    , updated_at
+    , deleted_at
+    , instance_id
+    , org_id
+    , username
+    , NULL AS first_name
+    , NULL AS last_name
+    , description 
+FROM
+    machine_users)
+));

backend/v3/storage/database/repository/stmt/v4/operators.go

@@ -0,0 +1,139 @@
+package v4
+
+import (
+	"time"
+
+	"golang.org/x/exp/constraints"
+)
+
+type Value interface {
+	Boolean | Number | Text | databaseInstruction
+}
+
+type Operator interface {
+	BooleanOperator | NumberOperator | TextOperator
+}
+
+type Text interface {
+	~string | ~[]byte
+}
+
+type TextOperator uint8
+
+const (
+	// TextOperatorEqual compares two strings for equality.
+	TextOperatorEqual TextOperator = iota + 1
+	// TextOperatorEqualIgnoreCase compares two strings for equality, ignoring case.
+	TextOperatorEqualIgnoreCase
+	// TextOperatorNotEqual compares two strings for inequality.
+	TextOperatorNotEqual
+	// TextOperatorNotEqualIgnoreCase compares two strings for inequality, ignoring case.
+	TextOperatorNotEqualIgnoreCase
+	// TextOperatorStartsWith checks if the first string starts with the second.
+	TextOperatorStartsWith
+	// TextOperatorStartsWithIgnoreCase checks if the first string starts with the second, ignoring case.
+	TextOperatorStartsWithIgnoreCase
+)
+
+var textOperators = map[TextOperator]string{
+	TextOperatorEqual:                " = ",
+	TextOperatorEqualIgnoreCase:      " LIKE ",
+	TextOperatorNotEqual:             " <> ",
+	TextOperatorNotEqualIgnoreCase:   " NOT LIKE ",
+	TextOperatorStartsWith:           " LIKE ",
+	TextOperatorStartsWithIgnoreCase: " LIKE ",
+}
+
+func writeTextOperation[T Text](builder *statementBuilder, col Column, op TextOperator, value T) {
+	switch op {
+	case TextOperatorEqual, TextOperatorNotEqual:
+		col.writeTo(builder)
+		builder.WriteString(textOperators[op])
+		builder.WriteString(builder.appendArg(value))
+	case TextOperatorEqualIgnoreCase, TextOperatorNotEqualIgnoreCase:
+		if ignoreCaseCol, ok := col.(ignoreCaseColumn); ok {
+			ignoreCaseCol.writeIgnoreCaseTo(builder)
+		} else {
+			builder.WriteString("LOWER(")
+			col.writeTo(builder)
+			builder.WriteString(")")
+		}
+		builder.WriteString(textOperators[op])
+		builder.WriteString("LOWER(")
+		builder.WriteString(builder.appendArg(value))
+		builder.WriteString(")")
+	case TextOperatorStartsWith:
+		col.writeTo(builder)
+		builder.WriteString(textOperators[op])
+		builder.WriteString(builder.appendArg(value))
+		builder.WriteString(" || '%'")
+	case TextOperatorStartsWithIgnoreCase:
+		if ignoreCaseCol, ok := col.(ignoreCaseColumn); ok {
+			ignoreCaseCol.writeIgnoreCaseTo(builder)
+		} else {
+			builder.WriteString("LOWER(")
+			col.writeTo(builder)
+			builder.WriteString(")")
+		}
+		builder.WriteString(textOperators[op])
+		builder.WriteString("LOWER(")
+		builder.WriteString(builder.appendArg(value))
+		builder.WriteString(")")
+		builder.WriteString(" || '%'")
+	default:
+		panic("unsupported text operation")
+	}
+}
+
+type Number interface {
+	constraints.Integer | constraints.Float | constraints.Complex | time.Time | time.Duration
+}
+
+type NumberOperator uint8
+
+const (
+	// NumberOperatorEqual compares two numbers for equality.
+	NumberOperatorEqual NumberOperator = iota + 1
+	// NumberOperatorNotEqual compares two numbers for inequality.
+	NumberOperatorNotEqual
+	// NumberOperatorLessThan compares two numbers to check if the first is less than the second.
+	NumberOperatorLessThan
+	// NumberOperatorLessThanOrEqual compares two numbers to check if the first is less than or equal to the second.
+	NumberOperatorAtLeast
+	// NumberOperatorGreaterThan compares two numbers to check if the first is greater than the second.
+	NumberOperatorGreaterThan
+	// NumberOperatorGreaterThanOrEqual compares two numbers to check if the first is greater than or equal to the second.
+	NumberOperatorAtMost
+)
+
+var numberOperators = map[NumberOperator]string{
+	NumberOperatorEqual:       " = ",
+	NumberOperatorNotEqual:    " <> ",
+	NumberOperatorLessThan:    " < ",
+	NumberOperatorAtLeast:     " <= ",
+	NumberOperatorGreaterThan: " > ",
+	NumberOperatorAtMost:      " >= ",
+}
+
+func writeNumberOperation[T Number](builder *statementBuilder, col Column, op NumberOperator, value T) {
+	col.writeTo(builder)
+	builder.WriteString(numberOperators[op])
+	builder.WriteString(builder.appendArg(value))
+}
+
+type Boolean interface {
+	~bool
+}
+
+type BooleanOperator uint8
+
+const (
+	BooleanOperatorIsTrue BooleanOperator = iota + 1
+	BooleanOperatorIsFalse
+)
+
+func writeBooleanOperation[T Boolean](builder *statementBuilder, col Column, value T) {
+	col.writeTo(builder)
+	builder.WriteString(" IS ")
+	builder.WriteString(builder.appendArg(value))
+}

backend/v3/storage/database/repository/stmt/v4/org.go

@@ -0,0 +1,18 @@
+package v4
+
+type Org struct {
+	InstanceID string
+	ID         string
+	Name       string
+	Dates
+}
+
+type GetOrg struct{}
+
+type ListOrgs struct{}
+
+type CreateOrg struct{}
+
+type UpdateOrg struct{}
+
+type DeleteOrg struct{}

backend/v3/storage/database/repository/stmt/v4/statement.go

@@ -0,0 +1,46 @@
+package v4
+
+import (
+	"strconv"
+	"strings"
+)
+
+type databaseInstruction string
+
+const (
+	nowDBInstruction  databaseInstruction = "NOW()"
+	nullDBInstruction databaseInstruction = "NULL"
+)
+
+type statementBuilder struct {
+	strings.Builder
+	args         []any
+	existingArgs map[any]string
+}
+
+func (b *statementBuilder) writeArg(arg any) {
+	b.WriteString(b.appendArg(arg))
+}
+
+func (b *statementBuilder) appendArg(arg any) (placeholder string) {
+	if b.existingArgs == nil {
+		b.existingArgs = make(map[any]string)
+	}
+	if placeholder, ok := b.existingArgs[arg]; ok {
+		return placeholder
+	}
+	if instruction, ok := arg.(databaseInstruction); ok {
+		return string(instruction)
+	}
+
+	b.args = append(b.args, arg)
+	placeholder = "$" + strconv.Itoa(len(b.args))
+	b.existingArgs[arg] = placeholder
+	return placeholder
+}
+
+func (b *statementBuilder) appendArgs(args ...any) {
+	for _, arg := range args {
+		b.appendArg(arg)
+	}
+}

backend/v3/storage/database/repository/stmt/v4/user.go

@@ -0,0 +1,239 @@
+package v4
+
+import (
+	"context"
+	"time"
+
+	"github.com/zitadel/zitadel/backend/v3/storage/database"
+)
+
+type Dates struct {
+	CreatedAt time.Time
+	UpdatedAt time.Time
+	DeletedAt time.Time
+}
+
+type User struct {
+	InstanceID string
+	OrgID      string
+	ID         string
+	Username   string
+	Traits     userTrait
+	Dates
+}
+
+type UserType string
+
+type userTrait interface {
+	userTrait()
+	Type() UserType
+}
+
+const userQuery = `SELECT u.instance_id, u.org_id, u.id, u.username, u.type, u.created_at, u.updated_at, u.deleted_at,` +
+	` h.first_name, h.last_name, h.email_address, h.email_verified_at, h.phone_number, h.phone_verified_at, m.description` +
+	` FROM users u` +
+	` LEFT JOIN user_humans h ON u.instance_id = h.instance_id AND u.org_id = h.org_id AND u.id = h.id` +
+	` LEFT JOIN user_machines m ON u.instance_id = m.instance_id AND u.org_id = m.org_id AND u.id = m.id`
+
+type user struct {
+	builder statementBuilder
+	client  database.QueryExecutor
+
+	condition Condition
+}
+
+func UserRepository(client database.QueryExecutor) *user {
+	return &user{
+		client: client,
+	}
+}
+
+func (u *user) WithCondition(condition Condition) *user {
+	u.condition = condition
+	return u
+}
+
+func (u *user) Get(ctx context.Context) (*User, error) {
+	u.builder.WriteString(userQuery)
+	u.writeCondition()
+	return scanUser(u.client.QueryRow(ctx, u.builder.String(), u.builder.args...))
+}
+
+func (u *user) List(ctx context.Context) (users []*User, err error) {
+	u.builder.WriteString(userQuery)
+	u.writeCondition()
+
+	rows, err := u.client.Query(ctx, u.builder.String(), u.builder.args...)
+	if err != nil {
+		return nil, err
+	}
+	defer func() {
+		closeErr := rows.Close()
+		if err != nil {
+			return
+		}
+		err = closeErr
+	}()
+	for rows.Next() {
+		user, err := scanUser(rows)
+		if err != nil {
+			return nil, err
+		}
+		users = append(users, user)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return users, nil
+}
+
+const (
+	createUserCte = `WITH user AS (` +
+		`INSERT INTO users (instance_id, org_id, id, username, type) VALUES ($1, $2, $3, $4, $5)` +
+		` RETURNING *)`
+	createHumanStmt = createUserCte + ` INSERT INTO user_humans h (instance_id, org_id, user_id, first_name, last_name, email_address, email_verified_at, phone_number, phone_verified_at)` +
+		` SELECT u.instance_id, u.org_id, u.id, $6, $7, $8, $9, $10, $11` +
+		` FROM user u` +
+		` RETURNING u.created_at, u.updated_at, u.deleted_at`
+	createMachineStmt = createUserCte + ` INSERT INTO user_machines (instance_id, org_id, user_id, description)` +
+		` SELECT u.instance_id, u.org_id, u.id, $6` +
+		` FROM user u` +
+		` RETURNING u.created_at, u.updated_at`
+)
+
+func (u *user) Create(ctx context.Context, user *User) error {
+	u.builder.appendArgs(user.InstanceID, user.OrgID, user.ID, user.Username, user.Traits.Type())
+	switch trait := user.Traits.(type) {
+	case *Human:
+		u.builder.WriteString(createHumanStmt)
+		u.builder.appendArgs(trait.FirstName, trait.LastName, trait.Email.Address, trait.Email.VerifiedAt, trait.Phone.Number, trait.Phone.VerifiedAt)
+	case *Machine:
+		u.builder.WriteString(createMachineStmt)
+		u.builder.appendArgs(trait.Description)
+	}
+	return u.client.QueryRow(ctx, u.builder.String(), u.builder.args...).Scan(user.CreatedAt, user.UpdatedAt)
+}
+
+func (u *user) InstanceIDColumn() Column {
+	return column{name: "u.instance_id"}
+}
+
+func (u *user) InstanceIDCondition(instanceID string) Condition {
+	return newTextCondition(u.InstanceIDColumn(), TextOperatorEqual, instanceID)
+}
+
+func (u *user) OrgIDColumn() Column {
+	return column{name: "u.org_id"}
+}
+
+func (u *user) OrgIDCondition(orgID string) Condition {
+	return newTextCondition(u.OrgIDColumn(), TextOperatorEqual, orgID)
+}
+
+func (u *user) IDColumn() Column {
+	return column{name: "u.id"}
+}
+
+func (u *user) IDCondition(userID string) Condition {
+	return newTextCondition(u.IDColumn(), TextOperatorEqual, userID)
+}
+
+func (u *user) UsernameColumn() Column {
+	return ignoreCaseCol{
+		column: column{name: "u.username"},
+		suffix: "_lower",
+	}
+}
+
+func (u user) SetUsername(username string) Change {
+	return newChange(u.UsernameColumn(), username)
+}
+
+func (u *user) UsernameCondition(op TextOperator, username string) Condition {
+	return newTextCondition(u.UsernameColumn(), op, username)
+}
+
+func (u *user) CreatedAtColumn() Column {
+	return column{name: "u.created_at"}
+}
+
+func (u *user) CreatedAtCondition(op NumberOperator, createdAt time.Time) Condition {
+	return newNumberCondition(u.CreatedAtColumn(), op, createdAt)
+}
+
+func (u *user) UpdatedAtColumn() Column {
+	return column{name: "u.updated_at"}
+}
+
+func (u *user) UpdatedAtCondition(op NumberOperator, updatedAt time.Time) Condition {
+	return newNumberCondition(u.UpdatedAtColumn(), op, updatedAt)
+}
+
+func (u *user) DeletedAtColumn() Column {
+	return column{name: "u.deleted_at"}
+}
+
+func (u *user) DeletedCondition(isDeleted bool) Condition {
+	if isDeleted {
+		return IsNotNull(u.DeletedAtColumn())
+	}
+	return IsNull(u.DeletedAtColumn())
+}
+
+func (u *user) DeletedAtCondition(op NumberOperator, deletedAt time.Time) Condition {
+	return newNumberCondition(u.DeletedAtColumn(), op, deletedAt)
+}
+
+func (u *user) writeCondition() {
+	if u.condition == nil {
+		return
+	}
+	u.builder.WriteString(" WHERE ")
+	u.condition.writeTo(&u.builder)
+}
+
+func scanUser(scanner database.Scanner) (*User, error) {
+	var (
+		user    User
+		human   Human
+		email   Email
+		phone   Phone
+		machine Machine
+		typ     UserType
+	)
+	err := scanner.Scan(
+		&user.InstanceID,
+		&user.OrgID,
+		&user.ID,
+		&user.Username,
+		&typ,
+		&user.Dates.CreatedAt,
+		&user.Dates.UpdatedAt,
+		&user.Dates.DeletedAt,
+		&human.FirstName,
+		&human.LastName,
+		&email.Address,
+		&email.VerifiedAt,
+		&phone.Number,
+		&phone.VerifiedAt,
+		&machine.Description,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	switch typ {
+	case UserTypeHuman:
+		if email.Address != "" {
+			human.Email = &email
+		}
+		if phone.Number != "" {
+			human.Phone = &phone
+		}
+		user.Traits = &human
+	case UserTypeMachine:
+		user.Traits = &machine
+	}
+
+	return &user, nil
+}

backend/v3/storage/database/repository/stmt/v4/user_human.go

@@ -0,0 +1,187 @@
+package v4
+
+import (
+	"context"
+	"time"
+)
+
+type Human struct {
+	FirstName string
+	LastName  string
+	Email     *Email
+	Phone     *Phone
+}
+
+const UserTypeHuman UserType = "human"
+
+func (Human) userTrait() {}
+
+func (h Human) Type() UserType {
+	return UserTypeHuman
+}
+
+var _ userTrait = (*Human)(nil)
+
+type Email struct {
+	Address string
+	Verification
+}
+
+type Phone struct {
+	Number string
+	Verification
+}
+
+type Verification struct {
+	VerifiedAt time.Time
+}
+
+type userHuman struct {
+	*user
+}
+
+func (u *user) Human() *userHuman {
+	return &userHuman{user: u}
+}
+
+const userEmailQuery = `SELECT h.email_address, h.email_verified_at FROM user_humans h`
+
+func (u *userHuman) GetEmail(ctx context.Context) (*Email, error) {
+	var email Email
+
+	u.builder.WriteString(userEmailQuery)
+	u.writeCondition()
+
+	err := u.client.QueryRow(ctx, u.builder.String(), u.builder.args...).Scan(
+		&email.Address,
+		&email.Verification.VerifiedAt,
+	)
+
+	if err != nil {
+		return nil, err
+	}
+	return &email, nil
+}
+
+func (h userHuman) Update(ctx context.Context, changes ...Change) error {
+	h.builder.WriteString(`UPDATE human_users h SET `)
+	Changes(changes).writeTo(&h.builder)
+	h.writeCondition()
+
+	stmt := h.builder.String()
+
+	return h.client.Exec(ctx, stmt, h.builder.args...)
+}
+
+func (h userHuman) SetFirstName(firstName string) Change {
+	return newChange(h.FirstNameColumn(), firstName)
+}
+
+func (h userHuman) FirstNameColumn() Column {
+	return column{"h.first_name"}
+}
+
+func (h userHuman) FirstNameCondition(op TextOperator, firstName string) Condition {
+	return newTextCondition(h.FirstNameColumn(), op, firstName)
+}
+
+func (h userHuman) SetLastName(lastName string) Change {
+	return newChange(h.LastNameColumn(), lastName)
+}
+
+func (h userHuman) LastNameColumn() Column {
+	return column{"h.last_name"}
+}
+
+func (h userHuman) LastNameCondition(op TextOperator, lastName string) Condition {
+	return newTextCondition(h.LastNameColumn(), op, lastName)
+}
+
+func (h userHuman) EmailAddressColumn() Column {
+	return ignoreCaseCol{
+		column: column{"h.email_address"},
+		suffix: "_lower",
+	}
+}
+
+func (h userHuman) EmailAddressCondition(op TextOperator, email string) Condition {
+	return newTextCondition(h.EmailAddressColumn(), op, email)
+}
+
+func (h userHuman) EmailVerifiedAtColumn() Column {
+	return column{"h.email_verified_at"}
+}
+
+func (h *userHuman) EmailAddressVerifiedCondition(isVerified bool) Condition {
+	if isVerified {
+		return IsNotNull(h.EmailVerifiedAtColumn())
+	}
+	return IsNull(h.EmailVerifiedAtColumn())
+}
+
+func (h userHuman) EmailVerifiedAtCondition(op TextOperator, emailVerifiedAt string) Condition {
+	return newTextCondition(h.EmailVerifiedAtColumn(), op, emailVerifiedAt)
+}
+
+func (h userHuman) SetEmailAddress(address string) Change {
+	return newChange(h.EmailAddressColumn(), address)
+}
+
+// SetEmailVerified sets the verified column of the email
+// if at is zero the statement uses the database timestamp
+func (h userHuman) SetEmailVerified(at time.Time) Change {
+	if at.IsZero() {
+		return newChange(h.EmailVerifiedAtColumn(), nowDBInstruction)
+	}
+	return newChange(h.EmailVerifiedAtColumn(), at)
+}
+
+func (h userHuman) SetEmail(address string, verified *time.Time) Change {
+	return newChanges(
+		h.SetEmailAddress(address),
+		newUpdatePtrColumn(h.EmailVerifiedAtColumn(), verified),
+	)
+}
+
+func (h userHuman) PhoneNumberColumn() Column {
+	return column{"h.phone_number"}
+}
+
+func (h userHuman) SetPhoneNumber(number string) Change {
+	return newChange(h.PhoneNumberColumn(), number)
+}
+
+func (h userHuman) PhoneNumberCondition(op TextOperator, phoneNumber string) Condition {
+	return newTextCondition(h.PhoneNumberColumn(), op, phoneNumber)
+}
+
+func (h userHuman) PhoneVerifiedAtColumn() Column {
+	return column{"h.phone_verified_at"}
+}
+
+func (h userHuman) PhoneNumberVerifiedCondition(isVerified bool) Condition {
+	if isVerified {
+		return IsNotNull(h.PhoneVerifiedAtColumn())
+	}
+	return IsNull(h.PhoneVerifiedAtColumn())
+}
+
+// SetPhoneVerified sets the verified column of the phone
+// if at is zero the statement uses the database timestamp
+func (h userHuman) SetPhoneVerified(at time.Time) Change {
+	if at.IsZero() {
+		return newChange(h.PhoneVerifiedAtColumn(), nowDBInstruction)
+	}
+	return newChange(h.PhoneVerifiedAtColumn(), at)
+}
+
+func (h userHuman) PhoneVerifiedAtCondition(op TextOperator, phoneVerifiedAt string) Condition {
+	return newTextCondition(h.PhoneVerifiedAtColumn(), op, phoneVerifiedAt)
+}
+
+func (h userHuman) SetPhone(number string, verifiedAt *time.Time) Change {
+	return newChanges(
+		h.SetPhoneNumber(number),
+		newUpdatePtrColumn(h.PhoneVerifiedAtColumn(), verifiedAt),
+	)
+}

backend/v3/storage/database/repository/stmt/v4/user_machine.go

@@ -0,0 +1,41 @@
+package v4
+
+import "context"
+
+type Machine struct {
+	Description string
+}
+
+func (Machine) userTrait() {}
+
+func (m Machine) Type() UserType {
+	return UserTypeMachine
+}
+
+const UserTypeMachine UserType = "machine"
+
+var _ userTrait = (*Machine)(nil)
+
+type userMachine struct {
+	*user
+}
+
+func (u *user) Machine() *userMachine {
+	return &userMachine{user: u}
+}
+
+func (m userMachine) Update(ctx context.Context, cols ...Change) (*Machine, error) {
+	return nil, nil
+}
+
+func (userMachine) DescriptionColumn() Column {
+	return column{"m.description"}
+}
+
+func (m userMachine) SetDescription(description string) Change {
+	return newChange(m.DescriptionColumn(), description)
+}
+
+func (m userMachine) DescriptionCondition(op TextOperator, description string) Condition {
+	return newTextCondition(m.DescriptionColumn(), op, description)
+}

backend/v3/storage/database/repository/stmt/v4/user_test.go

@@ -0,0 +1,65 @@
+package v4_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	v4 "github.com/zitadel/zitadel/backend/v3/storage/database/repository/stmt/v4"
+)
+
+func TestQueryUser(t *testing.T) {
+	t.Run("User filters", func(t *testing.T) {
+		user := v4.UserRepository(nil)
+		user.WithCondition(
+			v4.And(
+				v4.Or(
+					user.IDCondition("test"),
+					user.IDCondition("2"),
+				),
+				user.UsernameCondition(v4.TextOperatorStartsWithIgnoreCase, "test"),
+			),
+		).Get(context.Background())
+	})
+
+	t.Run("machine and human filters", func(t *testing.T) {
+		user := v4.UserRepository(nil)
+		machine := user.Machine()
+		human := user.Human()
+		user.WithCondition(
+			v4.And(
+				user.UsernameCondition(v4.TextOperatorStartsWithIgnoreCase, "test"),
+				v4.Or(
+					machine.DescriptionCondition(v4.TextOperatorStartsWithIgnoreCase, "test"),
+					human.EmailAddressVerifiedCondition(true),
+					v4.IsNotNull(machine.DescriptionColumn()),
+				),
+			),
+		)
+		human.GetEmail(context.Background())
+	})
+}
+
+type dbInstruction string
+
+func TestArg(t *testing.T) {
+	var bla any = "asdf"
+	instr, ok := bla.(dbInstruction)
+	assert.False(t, ok)
+	assert.Empty(t, instr)
+	bla = dbInstruction("asdf")
+	instr, ok = bla.(dbInstruction)
+	assert.True(t, ok)
+	assert.Equal(t, instr, dbInstruction("asdf"))
+}
+
+func TestWriteUser(t *testing.T) {
+	t.Run("update user", func(t *testing.T) {
+		user := v4.UserRepository(nil)
+		user.WithCondition(user.IDCondition("test")).Human().Update(
+			context.Background(),
+			user.SetUsername("test"),
+		)
+
+	})
+}

backend/v3/storage/database/repository/user.go

@@ -0,0 +1,39 @@
+package repository
+
+import (
+	"github.com/zitadel/zitadel/backend/v3/domain"
+	"github.com/zitadel/zitadel/backend/v3/storage/database"
+)
+
+type user struct {
+	database.QueryExecutor
+}
+
+func User(client database.QueryExecutor) domain.UserRepository {
+	// return &user{QueryExecutor: client}
+	return nil
+}
+
+// On implements [domain.UserRepository].
+func (exec *user) On(clauses ...domain.UserClause) domain.UserOperation {
+	return &userOperation{
+		QueryExecutor: exec.QueryExecutor,
+		clauses:       clauses,
+	}
+}
+
+// OnHuman implements [domain.UserRepository].
+func (exec *user) OnHuman(clauses ...domain.UserClause) domain.HumanOperation {
+	return &humanOperation{
+		userOperation: *exec.On(clauses...).(*userOperation),
+	}
+}
+
+// OnMachine implements [domain.UserRepository].
+func (exec *user) OnMachine(clauses ...domain.UserClause) domain.MachineOperation {
+	return &machineOperation{
+		userOperation: *exec.On(clauses...).(*userOperation),
+	}
+}
+
+// var _ domain.UserRepository = (*user)(nil)

backend/v3/storage/database/repository/user_human_operation.go

@@ -0,0 +1,36 @@
+package repository
+
+import (
+	"context"
+
+	"github.com/zitadel/zitadel/backend/v3/domain"
+)
+
+type humanOperation struct {
+	userOperation
+}
+
+// GetEmail implements domain.HumanOperation.
+func (h *humanOperation) GetEmail(ctx context.Context) (*domain.Email, error) {
+	var email domain.Email
+	err := h.QueryExecutor.QueryRow(ctx, `SELECT email, is_email_verified FROM human_users WHERE id = $1`, h.clauses).Scan(
+		&email.Address,
+		&email.IsVerified,
+	)
+	if err != nil {
+		return nil, err
+	}
+	return &email, nil
+}
+
+// SetEmail implements domain.HumanOperation.
+func (h *humanOperation) SetEmail(ctx context.Context, email string) error {
+	return h.QueryExecutor.Exec(ctx, `UPDATE human_users SET email = $1 WHERE id = $2`, email, h.clauses)
+}
+
+// SetEmailVerified implements domain.HumanOperation.
+func (h *humanOperation) SetEmailVerified(ctx context.Context, email string) error {
+	return h.QueryExecutor.Exec(ctx, `UPDATE human_users SET is_email_verified = $1 WHERE id = $2 AND email = $3`, true, h.clauses, email)
+}
+
+var _ domain.HumanOperation = (*humanOperation)(nil)

backend/v3/storage/database/repository/user_machine_operation.go

@@ -0,0 +1,18 @@
+package repository
+
+import (
+	"context"
+
+	"github.com/zitadel/zitadel/backend/v3/domain"
+)
+
+type machineOperation struct {
+	userOperation
+}
+
+// SetDescription implements domain.MachineOperation.
+func (m *machineOperation) SetDescription(ctx context.Context, description string) error {
+	return m.QueryExecutor.Exec(ctx, `UPDATE machines SET description = $1 WHERE id = $2`, description, m.clauses)
+}
+
+var _ domain.MachineOperation = (*machineOperation)(nil)

backend/v3/storage/database/repository/user_operation.go

@@ -0,0 +1,68 @@
+package repository
+
+import (
+	"context"
+
+	"github.com/zitadel/zitadel/backend/v3/domain"
+	"github.com/zitadel/zitadel/backend/v3/storage/database"
+)
+
+type userOperation struct {
+	database.QueryExecutor
+	clauses []domain.UserClause
+}
+
+// Delete implements [domain.UserOperation].
+func (u *userOperation) Delete(ctx context.Context) error {
+	return u.QueryExecutor.Exec(ctx, `DELETE FROM users WHERE id = $1`, u.clauses)
+}
+
+// SetUsername implements [domain.UserOperation].
+func (u *userOperation) SetUsername(ctx context.Context, username string) error {
+	var stmt statement
+
+	stmt.builder.WriteString(`UPDATE users SET username = $1 WHERE `)
+	stmt.appendArg(username)
+	clausesToSQL(&stmt, u.clauses)
+	return u.QueryExecutor.Exec(ctx, stmt.builder.String(), stmt.args...)
+}
+
+var _ domain.UserOperation = (*userOperation)(nil)
+
+func UserIDQuery(id string) domain.UserClause {
+	return textClause[string]{
+		clause: clause[domain.TextOperation]{
+			field: userFields[domain.UserFieldID],
+			op:    domain.TextOperationEqual,
+		},
+		value: id,
+	}
+}
+
+func HumanEmailQuery(op domain.TextOperation, email string) domain.UserClause {
+	return textClause[string]{
+		clause: clause[domain.TextOperation]{
+			field: userFields[domain.UserHumanFieldEmail],
+			op:    op,
+		},
+		value: email,
+	}
+}
+
+func HumanEmailVerifiedQuery(op domain.BoolOperation) domain.UserClause {
+	return boolClause[domain.BoolOperation]{
+		clause: clause[domain.BoolOperation]{
+			field: userFields[domain.UserHumanFieldEmailVerified],
+			op:    op,
+		},
+	}
+}
+
+func clausesToSQL(stmt *statement, clauses []domain.UserClause) {
+	for _, clause := range clauses {
+
+		stmt.builder.WriteString(userFields[clause.Field()].String())
+		stmt.builder.WriteString(clause.Operation().String())
+		stmt.appendArg(clause.Args()...)
+	}
+}