Go from per document to per vault version ids to allow "since" queries

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

@@ -1,25 +1,24 @@
 CREATE TABLE IF NOT EXISTS documents (
     vault_id TEXT NOT NULL,
+    vault_update_id INTEGER NOT NULL,
     relative_path TEXT NOT NULL,
-    version_id INTEGER NOT NULL,
     created_date TIMESTAMP NOT NULL,
     updated_date TIMESTAMP NOT NULL,
     content BLOB NOT NULL,
     is_deleted BOOLEAN NOT NULL,
-    PRIMARY KEY (vault_id, relative_path, version_id)
+    PRIMARY KEY (vault_id, vault_update_id)
 );
 
 CREATE VIEW IF NOT EXISTS latest_document_versions AS
 SELECT d.*
 FROM documents d
 INNER JOIN (
-    SELECT vault_id, relative_path, MAX(version_id) AS max_version_id
+    SELECT vault_id, MAX(vault_update_id) AS max_version_id
     FROM documents
     GROUP BY vault_id, relative_path
 ) max_versions
 ON d.vault_id = max_versions.vault_id
-AND d.relative_path = max_versions.relative_path
-AND d.version_id = max_versions.max_version_id;
+AND d.vault_update_id = max_versions.max_version_id;
 
 CREATE INDEX IF NOT EXISTS idx_documents_vault_doc
 ON documents (vault_id, relative_path);