diff --git a/pkg/icingadb/v1/entity.go b/pkg/icingadb/v1/entity.go
new file mode 100644
index 00000000..ea599615
--- /dev/null
+++ b/pkg/icingadb/v1/entity.go
@@ -0,0 +1,24 @@
+package v1
+
+import "github.com/icinga/icingadb/pkg/contracts"
+
+// EntityWithoutChecksum represents entities without a checksum.
+type EntityWithoutChecksum struct {
+	IdMeta `json:",inline"`
+}
+
+// Fingerprint implements the contracts.Fingerprinter interface.
+func (e EntityWithoutChecksum) Fingerprint() contracts.Fingerprinter {
+	return e
+}
+
+// EntityWithChecksum represents entities with a checksum.
+type EntityWithChecksum struct {
+	EntityWithoutChecksum
+	ChecksumMeta `json:",inline"`
+}
+
+// Fingerprint implements the contracts.Fingerprinter interface.
+func (e EntityWithChecksum) Fingerprint() contracts.Fingerprinter {
+	return e
+}
diff --git a/pkg/icingadb/v1/meta.go b/pkg/icingadb/v1/meta.go
new file mode 100644
index 00000000..b44e7756
--- /dev/null
+++ b/pkg/icingadb/v1/meta.go
@@ -0,0 +1,53 @@
+package v1
+
+import (
+	"github.com/icinga/icingadb/pkg/contracts"
+	"github.com/icinga/icingadb/pkg/types"
+)
+
+// ChecksumMeta is embedded by every type with a checksum.
+type ChecksumMeta struct {
+	PropertiesChecksum types.Binary `json:"checksum"`
+}
+
+// Checksum implements part of the contracts.Checksumer interface.
+func (m ChecksumMeta) Checksum() contracts.Checksum {
+	return m.PropertiesChecksum
+}
+
+// SetChecksum implements part of the contracts.Checksumer interface.
+func (m *ChecksumMeta) SetChecksum(checksum contracts.Checksum) {
+	m.PropertiesChecksum = checksum.(types.Binary)
+}
+
+// EnvironmentMeta is embedded by every type which belongs to an environment.
+type EnvironmentMeta struct {
+	EnvironmentId types.Binary `json:"environment_id"`
+}
+
+// IdMeta is embedded by every type Icinga DB should synchronize.
+type IdMeta struct {
+	Id types.Binary `json:"id"`
+}
+
+// ID implements part of the contracts.IDer interface.
+func (m IdMeta) ID() contracts.ID {
+	return m.Id
+}
+
+// SetID implements part of the contracts.IDer interface.
+func (m *IdMeta) SetID(id contracts.ID) {
+	m.Id = id.(types.Binary)
+}
+
+// NameMeta is embedded by every type with a name.
+type NameMeta struct {
+	Name         string       `json:"name"`
+	NameChecksum types.Binary `json:"name_checksum"`
+}
+
+// NameCiMeta is embedded by every type with a case insensitive name.
+type NameCiMeta struct {
+	NameMeta
+	NameCi *string `json:"name_ci"`
+}