Add WebSocket support (#12)

backend/sync_server/src/app_state/database/migrations/20241207143519_bootstrap.sql

@@ -0,0 +1,21 @@
+CREATE TABLE IF NOT EXISTS documents (
+    vault_update_id INTEGER NOT NULL PRIMARY KEY,
+    document_id TEXT NOT NULL,
+    relative_path TEXT NOT NULL,
+    updated_date TIMESTAMP NOT NULL,
+    content BLOB NOT NULL,
+    is_deleted BOOLEAN NOT NULL
+);
+
+CREATE VIEW IF NOT EXISTS latest_document_versions AS
+SELECT d.*
+FROM documents d
+INNER JOIN (
+    SELECT MAX(vault_update_id) AS max_version_id
+    FROM documents
+    GROUP BY document_id
+) max_versions
+ON d.vault_update_id = max_versions.max_version_id;
+
+CREATE INDEX IF NOT EXISTS idx_documents_vault_id_relative_path
+ON documents (relative_path);

backend/sync_server/src/app_state/database/models.rs

@@ -0,0 +1,68 @@
+use chrono::{DateTime, Utc};
+use schemars::JsonSchema;
+use serde::Serialize;
+use sync_lib::bytes_to_base64;
+
+pub type VaultId = String;
+pub type VaultUpdateId = i64;
+pub type DocumentId = uuid::Uuid;
+
+#[derive(Debug, Clone)]
+pub struct StoredDocumentVersion {
+    pub vault_update_id: VaultUpdateId,
+    pub document_id: DocumentId,
+    pub relative_path: String,
+    pub updated_date: DateTime<Utc>,
+    pub content: Vec<u8>,
+    pub is_deleted: bool,
+}
+
+impl PartialEq<Self> for StoredDocumentVersion {
+    fn eq(&self, other: &Self) -> bool { self.vault_update_id == other.vault_update_id }
+}
+
+#[derive(Debug, Clone, Serialize, JsonSchema)]
+#[serde(rename_all = "camelCase")]
+pub struct DocumentVersionWithoutContent {
+    pub vault_update_id: VaultUpdateId,
+    pub document_id: DocumentId,
+    pub relative_path: String,
+    pub updated_date: DateTime<Utc>,
+    pub is_deleted: bool,
+}
+
+impl From<StoredDocumentVersion> for DocumentVersionWithoutContent {
+    fn from(value: StoredDocumentVersion) -> Self {
+        Self {
+            vault_update_id: value.vault_update_id,
+            document_id: value.document_id,
+            relative_path: value.relative_path,
+            updated_date: value.updated_date,
+            is_deleted: value.is_deleted,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, JsonSchema)]
+#[serde(rename_all = "camelCase")]
+pub struct DocumentVersion {
+    pub vault_update_id: VaultUpdateId,
+    pub document_id: DocumentId,
+    pub relative_path: String,
+    pub updated_date: DateTime<Utc>,
+    pub content_base64: String,
+    pub is_deleted: bool,
+}
+
+impl From<StoredDocumentVersion> for DocumentVersion {
+    fn from(value: StoredDocumentVersion) -> Self {
+        Self {
+            vault_update_id: value.vault_update_id,
+            document_id: value.document_id,
+            relative_path: value.relative_path,
+            updated_date: value.updated_date,
+            content_base64: bytes_to_base64(&value.content),
+            is_deleted: value.is_deleted,
+        }
+    }
+}