I'll start by offering a little clarity about the tools/technologies you mentioned: DECS is for real-time only, i.e. I create, delete or edit and save a document from a Notes client or Web browser (some UI interaction) and something happens to a backend database (an insert, delete, or update, respectively). JDBC and the LC LSX are programmatic interfaces (don't bother with LS:DO; Lotus only continues to ship it for legacy support). LEI does a variety of batch processes, plus real-time (same as DECS) and polling. Since you know LotusScript I suggest that you look at the LC LSX. I recently wrote an article for the Advisor Expert on Lotus Notes & Domino R5 with details on how to use the LC LSX that you should find helpful.
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