feat: postgres investigations

[cdummett]

Description

PR adds capabilities for logging the size of the data-node postgres database to the parameter experiments. PR also adds experiments and notebooks for analysing the following network parameters:

• market.margin.scalingFactor
• network.markPriceUpdateMaximumFrequency

Param: network.markPriceUpdateMaximumFrequency

Increasing the parameter increases database size. Current mainnet value of 5s gives a memory decrease of ~8% whilst the maximum saving is ~13%.

Param: market.margin.scalingFactor

Two sets of values tested for mainnet:

1. {"search_level": 1.050, "initial_margin": 1.100, "collateral_release": 1.150}
2. {"search_level": 1.001, "initial_margin": 2.000, "collateral_release": 4.000}

Option 2 gives a ~3% memory saving over Option 1.

Testing

Passing all tests locally.

Breaking Changes

None

Closes

Closes #358