Description of problem:
Deleting a probe results in exception

Version-Release number of selected component (if applicable):
1.6 with postgres backend

How reproducible:
try to delete a probe
  
Actual results:
[TP-Processor2] ERROR com.redhat.rhn.common.db.datasource.CachedStatement - Error while processing cached statement sql: DELETE /*+index(time_series time_series_probe_id_idx)*/
  FROM time_series
  WHERE substr(o_id, instr(o_id, '-') + 1,
        (instr(o_id, '-', instr(o_id, '-') + 1) - instr(o_id, '-'))    - 1) = ?
com.redhat.rhn.common.db.WrappedSQLException: ERROR: operator does not exist: text = bigint
  Hint: No operator matches the given name and argument type(s). You might need to add explicit type casts.

Expected results:
should delete the probe