storage: test sqlite in-memory

storage/sqlite3.go

@@ -5,11 +5,10 @@ import "database/sql"
 func createBlockTable(conn *sql.DB) error {
 	tableCreation := `
 		CREATE TABLE IF NOT EXISTS blocks (
-			height INTEGER,
+			height INTEGER PRIMARY KEY,
 			hash TEXT,
 			has_sapling_tx BOOL,
-			compact_encoding BLOB,
-			PRIMARY KEY (height, hash)
+			compact_encoding BLOB
 		);
 	`
 	_, err := conn.Exec(tableCreation)