create a single in-memory sqlite db connection by default

Author: lovasoa

src/webserver/database/mod.rs

@@ -234,10 +234,15 @@ impl Database {
                 match db_kind {
                     AnyKind::Postgres => 50,
                     AnyKind::MySql => 75,
-                    AnyKind::Sqlite => 16,
+                    AnyKind::Sqlite => {
+                        if config.database_url.contains(":memory:") {
+                            // Create no more than a single in-memory database connection
+                            1
+                        } else {
+                            16
+                        }
+                    }
                     AnyKind::Mssql => 100,
-                    #[allow(unreachable_patterns)]
-                    _ => unreachable!("unsupported database"),
                 }
             })
             .idle_timeout(