fix(db): add more indexes to optimize versions endpoint performance

For document or collection versions we want the query times to be really
fast. Since for both types of queries we do LEFT JOINS to retrieve
relevant versions, index the `publication_version` and
`publication_has_publication_versions` ids. Add a couple of additional
indexes for the `document_change` and `library_change` tables.

migrations/sqlite/20240115152953_initial_db.down.sql

@@ -2,8 +2,18 @@
 PRAGMA foreign_keys = OFF;
 
 DROP INDEX IF EXISTS changed_library_document_library_mpath_idx;
+DROP INDEX IF EXISTS library_change_status_idx;
 DROP INDEX IF EXISTS library_change_library_mpath_idx;
+
+DROP INDEX IF EXISTS publication_version_id_idx;
+
+DROP INDEX IF EXISTS publication_has_publication_versions_publication_version_id_idx;
+DROP INDEX IF EXISTS publication_has_publication_versions_publication_id_idx;
+
+DROP INDEX IF EXISTS document_change_status_idx;
+DROP INDEX IF EXISTS document_change_publication_version_id_idx;
 DROP INDEX IF EXISTS document_change_doc_mpath_idx;
+DROP INDEX IF EXISTS document_change_doc_mpath_pub_id_status_idx;
 
 DROP TABLE IF EXISTS changed_library_document;
 DROP TABLE IF EXISTS library_change;

migrations/sqlite/20240115152953_initial_db.up.sql

@@ -82,7 +82,17 @@ CREATE TABLE document_change (
         ON DELETE CASCADE,
     PRIMARY KEY (id)
 );
+
+CREATE INDEX document_change_doc_mpath_pub_id_status_idx ON document_change(doc_mpath COLLATE NOCASE, publication_version_id, status);
 CREATE INDEX document_change_doc_mpath_idx ON document_change(doc_mpath COLLATE NOCASE);
+CREATE INDEX document_change_publication_version_id_idx ON document_change(publication_version_id);
+CREATE INDEX document_change_status_idx ON document_change(status);
+
+CREATE INDEX publication_has_publication_versions_publication_id_idx ON publication_has_publication_versions(publication_id);
+CREATE INDEX publication_has_publication_versions_publication_version_id_idx ON publication_has_publication_versions(publication_version_id);
+
+CREATE INDEX publication_version_id_idx ON publication_version(id);
+
 CREATE TABLE library_change (
     publication_version_id TEXT,
     status TEXT,
@@ -103,6 +113,8 @@ CREATE TABLE changed_library_document (
     PRIMARY KEY (document_change_id, library_mpath)
 );
 CREATE INDEX library_change_library_mpath_idx ON library_change(library_mpath COLLATE NOCASE);
+CREATE INDEX library_change_status_idx ON library_change(status);
+
 CREATE INDEX changed_library_document_library_mpath_idx ON changed_library_document(library_mpath COLLATE NOCASE);
 
 PRAGMA optimize;