Question: Is there any open source findbugs detectors extensions, espcially for performance bugs, for low-latency? I didn't find any meaningful extension beyond barebone findbugs impl.

Answer: 
Your code seems ok - did you copy the db to the ressource folder of your project?

**EDIT**

Make sure you access your db file with something like that:

```
    - (void) initializeDB {

        // Get the database from the application bundle
        NSString* path = [[NSBundle mainBundle] pathForResource:@"tblStore" ofType:@"sqlite"];

        if (sqlite3_open([path UTF8String], &database) == SQLITE_OK) 
        {
            NSLog(@"Opening Database"); 
        }
        else
        {
            // Call close to properly clean up
            sqlite3_close(database);

            NSAssert1(0, @"Error: failed to open database: '%s'.", 
                      sqlite3_errmsg(database));
        }

}

```
The database file you add to the project will be embedded in the main `NSBundle` (see `[NSBundle mainBundle]`).

In order to do what you want, you need to copy the database from the main bundle to the documents folder before trying to access it. Otherwise, as you are experiencing, you will not be able to find the SQLite DB on the document's folder.