* Make clicking "Unknown" language do nothing. #97 * Implement user cache using embedded H2. * Separate caching to its own service #110 * Change UserProfile to be not Serializable * Fix copy-paste errors. * Replace Jackson with Gson which reduced boilerplate code by a bit. * Introduce an extension function * Remove unnecessary JsonDeserializer class. Instead, I decided to use a simple TypeAdapter in order to deserialize number into java.util.Date. * Switch back to Jackson as deserializer. * Add warning suppression. * Replace redundant creation of ObjectMapper. * Replace LocalDateTime with Instant. * Prevent multiple invocations of generateUserProfile. * Cache by lazy. * Remove unnecessary JSON deserialization from lookUpInCache. * Prevent NPE. * Update src/main/kotlin/app/CacheService.kt Co-authored-by: Sidd <iProdigy@users.noreply.github.com> * Revert "Prevent multiple invocations of generateUserProfile." This reverts commit 8306d92 * Remove unnecessary custom deserializer. * Rename function. UserService#lookUpInCache → selectJsonFromDb * Reduce invocations of CacheService#selectJsonFromDb. * Extract functions from duplicate code. * Update src/main/kotlin/app/CacheService.kt Co-authored-by: Sidd <iProdigy@users.noreply.github.com> * Remove unnecessary class UserNotLoadableException. * Remove unnecessary lazy initialization. * Change id values to lowercase in DB. follow-up change to 80154a0 * Change data type of `timestamp` from 'TIMESTAMP WITH TIME ZONE' to 'TIMESTAMP'. * Use HikariCP. * Update src/main/kotlin/app/util/HikariCpDataSource.kt Co-authored-by: Sidd <iProdigy@users.noreply.github.com> * Replace string concatenation with multi-line string * Replace uses of magic numbers * Remove intermediate local variable * Make CacheService have `HikariCpDataSource.connection` as its field Co-authored-by: Sidd <iProdigy@users.noreply.github.com>

Change Cache to be an embedded DB #110

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