improvement: increase connection cache size

src/repo/sqlite_migration.rs

@@ -17,6 +17,7 @@ PRAGMA main.synchronous = NORMAL;
 PRAGMA foreign_keys = ON;
 PRAGMA journal_size_limit = 32768;
 PRAGMA temp_store = 2; -- use memory, not temp files
+PRAGMA main.cache_size = 20000; -- 80MB max cache size per conn
 pragma mmap_size = 17179869184; -- cap mmap at 16GB
 "##;