kora-database-jdbclisted

# Kora Database JDBC > **Kora sub-skill — obey the [kora-v1 meta rules](../../SKILL.md) on every task:** **R0** ensure `.kora-agent/` docs+examples are cloned · **R1** read this sub-skill before writing code · **R2** Kora APIs only — no Spring/Micronaut/Quarkus, no invented annotations or config keys · **R3** journal any incorrect Kora usage. Add comments/Javadoc only if asked. JDBC-based relational database access (PostgreSQL, MySQL, Oracle) with HikariCP. Repositories are `@Repository` interfaces whose implementations are generated at compile time by the annotation processor — no reflection, no runtime proxies. > **Prefer synchronous repository signatures** (`Entity`, `@Nullable Entity`, `List<Entity>`, `UpdateCount`). The blocking JDBC driver runs on the executor bound to `JdbcDatabase`; virtual threads or a fixed pool handle blocking efficiently. Reach for `CompletionStage`/`Mono` only when a downstream contract requires it. --- ## Quick Start ### 1. Dependencies (`build.gradle`) ```groovy dependencies { koraBom platform("ru.tinkoff.kora:kora-parent:1.2.19") annotationProcessor "ru.tinkoff.kora:annotation-processors" // mandatory: generates *RepositoryImpl implementation "ru.tinkoff.kora:database-jdbc" implementation "ru.tinkoff.kora:config-hocon" implementation "ru.tinkoff.kora:logging-logback" implementation "org.postgresql:postgresql:42.7.7" // JDBC driver is required (not bundled) } ``` All `ru.tinkoff.kora:*` artifacts inherit thei