(logical) Success of operation. Typically TRUE if
document(s) or collection existed, and FALSE if document(s)
did not exist, or collection did not exist, or delete was not successful.
Arguments
src
Source object, result of call to any of functions
src_mongo(), src_sqlite(), src_elastic(), src_couchdb()src_duckdb() or src_postgres()
key
(character) The name of the container in the
database backend (corresponds to collection for MongoDB,
dbname for CouchDB, index for Elasticsearch, and to
a table name for DuckDB, SQLite and PostgreSQL)
...
Optionally, specify query parameter with a
JSON string as per docdb_query() to identify documents to be deleted.
If not specified (default), deletes the container key.