Trigger to audit DML and DDL not working

Requirement: Application team complains that everyday within a fixed timeframe, 1 entry from a particular table is being deleted. They are unable to track it, which particular job is it doing it.

DBA: We had 3 solutions: 1. AUDIT_TRAIL
                                    2. FGA
                                    3. Customized TRIGGER to track the DML and DDL.
After discussion, option 3 has been implemented. Here is the code.

DML Trigger
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CREATE OR REPLACE TRIGGER SLCPROD.STORE_TERM_ID_HST_TRG
BEFORE  INSERT OR UPDATE OR DELETE
   ON SLCPROD.STORE_TERM_ID    FOR EACH ROW
BEGIN

   IF INSERTING THEN
  
   INSERT INTO STORE_TERM_ID_HIST
   ( STR_NUM,
     TERM_ID,
     HOST_ENV,
     USR_TERMINAL,