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fix(mcp): the SQL guard's function denylist also matches quoted names (#1769) - #1782
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…, and covers more MySQL and PostgreSQL functions (#1769)
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Closes #1769.
"and backtick) are dropped from the copy used for the function denylist, so"nextval"('s')andpg_catalog."pg_terminate_backend"(1)are refused like the unquoted forms.SLEEP,BENCHMARK,GET_LOCK,RELEASE_LOCK,RELEASE_ALL_LOCKS,IS_FREE_LOCK; PostgreSQLPG_STAT_RESET*,PG_SWITCH_WAL,PG_CREATE_RESTORE_POINT,PG_LOGICAL_EMIT_MESSAGE,PG_PROMOTE,PG_DROP_REPLICATION_SLOT.