Gerolf Seitz fe7e5615b8

Improve performance of stakeholder retrieval from SQL (#3207) ...

Instead of loading and deserializing the transaction, we store the
stakeholders in tables contract_signatories and contract_observers.

To avoid having to do an extra roundtrip for fetching the stakeholders,
we aggregate the parties at query time into a % separated string (% is
not a valid character for parties), which we then split again in the
application.

Fixes #2330.

2019-10-28 14:16:21 +01:00

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