set synchronous to NORMAL for all connections

src/database/mod.rs

@@ -219,6 +219,10 @@ impl ConnectionOptions {
             trace!("Setting busy_timeout to {:?}", duration);
             conn.execute(&format!("PRAGMA busy_timeout = {};", duration.as_millis()))?;
         }
+
+        trace!("Setting \"synchronous\" to NORMAL");
+        conn.execute("PRAGMA synchronous = NORMAL;")?;
+
         Ok(())
     }
 }