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));
        }

}

```
You can copy your database, click finder and write this address(/Users/administrator/Library/Application Support/iPhone Simulator/6.1/Applications/) in finder click ok.
You will get documentary path. 
Open your project document file and paste your database....