Fix/using postgresql with hikaricp (#1867)

* Set default schema for postgresql db

The schema was only set once during startup. This is, however, only set for the current connection. So when using hikaricp, depending on which connection was used, the schema might have been set, or it might not have been set.

fixes #1670

* Revert "Fix database connection and errors (#1681)"

This reverts commit 2e0f72f182.

Not necessary anymore as the issue that this change intended to fix is now fixed with 091206800025ed9370d611e7ca3430ab409a0cb2

server/src/main/kotlin/suwayomi/tachidesk/server/database/DBManager.kt

@@ -65,11 +65,11 @@ object DBManager {
 
                 // Optimized for Raspberry Pi / Low memory environments
                 maximumPoolSize = 6 // Moderate pool for better concurrency
+                minimumIdle = 2 // Keep 2 idle connections for responsiveness
                 connectionTimeout = 45.seconds.inWholeMilliseconds // more tolerance for slow devices
                 idleTimeout = 5.minutes.inWholeMilliseconds // close idle connections faster
                 maxLifetime = 15.minutes.inWholeMilliseconds // recycle connections more often
                 leakDetectionThreshold = 1.minutes.inWholeMilliseconds
-                isAutoCommit = false
 
                 // Pool name for monitoring
                 poolName = "Suwayomi-DB-Pool"
@@ -94,6 +94,11 @@ object DBManager {
                 useNestedTransactions = true
                 @OptIn(ExperimentalKeywordApi::class)
                 preserveKeywordCasing = false
+                defaultSchema =
+                    when (serverConfig.databaseType.value) {
+                        DatabaseType.POSTGRESQL -> Schema("suwayomi")
+                        DatabaseType.H2 -> null
+                    }
             }
 
         return if (serverConfig.useHikariConnectionPool.value) {
@@ -175,7 +180,6 @@ fun databaseUp() {
                         serverConfig.databaseUsername.value.takeIf { it.isNotBlank() },
                     )
                 SchemaUtils.createSchema(schema)
-                SchemaUtils.setSchema(schema)
             }
         }
         val migrations = loadMigrationsFrom("suwayomi.tachidesk.server.database.migration", ServerConfig::class.java)