diff --git a/backend/sync_server/src/database/models.rs b/backend/sync_server/src/database/models.rs
new file mode 100644
index 0000000..aa22d70
--- /dev/null
+++ b/backend/sync_server/src/database/models.rs
@@ -0,0 +1,82 @@
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+use sync_lib::bytes_to_base64;
+
+pub type VaultId = String;
+pub type DocumentId = uuid::Uuid;
+pub type DocumentVersionId = i64;
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct StoredDocumentVersion {
+    pub vault_id: VaultId,
+    pub document_id: DocumentId,
+    pub version_id: DocumentVersionId,
+    pub created_date: DateTime<Utc>,
+    pub updated_date: DateTime<Utc>,
+    pub relative_path: String,
+    pub content: Vec<u8>,
+    pub is_binary: bool,
+    pub is_deleted: bool,
+}
+
+impl StoredDocumentVersion {
+    pub fn content_as_string(&self) -> String {
+        String::from_utf8_lossy(&self.content).to_string()
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct DocumentVersionWithoutContent {
+    pub vault_id: VaultId,
+    pub document_id: DocumentId,
+    pub version_id: DocumentVersionId,
+    pub created_date: DateTime<Utc>,
+    pub updated_date: DateTime<Utc>,
+    pub relative_path: String,
+    pub is_binary: bool,
+    pub is_deleted: bool,
+}
+
+impl From<StoredDocumentVersion> for DocumentVersionWithoutContent {
+    fn from(value: StoredDocumentVersion) -> Self {
+        Self {
+            vault_id: value.vault_id,
+            document_id: value.document_id,
+            version_id: value.version_id,
+            created_date: value.created_date,
+            updated_date: value.updated_date,
+            relative_path: value.relative_path,
+            is_binary: value.is_binary,
+            is_deleted: value.is_deleted,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct DocumentVersion {
+    pub vault_id: VaultId,
+    pub document_id: DocumentId,
+    pub version_id: DocumentVersionId,
+    pub created_date: DateTime<Utc>,
+    pub updated_date: DateTime<Utc>,
+    pub relative_path: String,
+    pub content_base64: String,
+    pub is_binary: bool,
+    pub is_deleted: bool,
+}
+
+impl From<StoredDocumentVersion> for DocumentVersion {
+    fn from(value: StoredDocumentVersion) -> Self {
+        Self {
+            vault_id: value.vault_id,
+            document_id: value.document_id,
+            version_id: value.version_id,
+            created_date: value.created_date,
+            updated_date: value.updated_date,
+            relative_path: value.relative_path,
+            content_base64: bytes_to_base64(&value.content),
+            is_binary: value.is_binary,
+            is_deleted: value.is_deleted,
+        }
+    }
+}
diff --git a/backend/sync_server/src/server/requests.rs b/backend/sync_server/src/server/requests.rs
new file mode 100644
index 0000000..fdcc307
--- /dev/null
+++ b/backend/sync_server/src/server/requests.rs
@@ -0,0 +1,15 @@
+use chrono::{DateTime, Utc};
+use serde::Deserialize;
+
+#[derive(Debug, Deserialize)]
+pub struct CreateDocumentVersion {
+    pub created_date: DateTime<Utc>,
+    pub relative_path: String,
+    pub content_base64: String,
+    pub is_binary: bool,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct DeleteDocumentVersion {
+    pub created_date: DateTime<Utc>,
+}