feat: reusing of datasources

Riabokon Stanislav(EPAM)[GCP]requested to merge
connection-optimization into main

Issue: #57 (closed)

  • Added a PoolKey (composed of url username and password) to identify shared data sources.

Tenants using the same database resource now reuse a single HikariDataSource, reducing the total number of open connection pools and improving scalability.

Edited by Riabokon Stanislav(EPAM)[GCP]

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