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The LogClient functionality is used in the Web POS to generate log messages in the client side, which are then synchronized to the backend side so they can be later on analyzed easily.

Currently it is working correctly in general, although there are two improvements which can be done to increase performance and reduce the database space and network bandwith this functionality uses.

Phase 1: Space and bandwith improvement

Currently the log client is sending the same information twice to the backend (as separate properties, and then as part of a big JSON object which contains the same information). This can be easily improved so that the requests take half the network bandwidth.

Apart from this, the backend table itself contains also separate columns for each property, and also a column for the JSON information, which means that it is taking double the required space in the database. This can also be improved.

Bulbgraph.png   Note: This phase has been included in 3.0RR16Q3

Phase 2: Performance on the client side

Currently it seems the log client degrades a bit (or significantly, depending on the case) the performance of the client side, due to the fact that every message is immediately saved via a separate transaction in the local database. Over the day, this can add up significantly, and as we have seen in previous analysis, writing in the local database seems to be particularly expensive from the performance point of view.

The main idea here is to reduce these writings to the local database, via several possible optimizations:

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