External Source/Database for Parameters of EA (mql4)

I am seeking a skilled programmer to program a function for my EA in mql4.

Function call must send an input value (name of symbol, e.g. EURUSD, GBPUSD, …) to an external source/database and retrieve from the external source a set of parameters which are required for the EA.

The received set of parameters are different for each symbol (input value). All sets of parameters for the different symbols are stored on the external source/database.
Each set of parameters contains the following parameters:

•          4x double
•           1x bool 
•           1x int 
•           1x datetime array 
•           1x double array

The arrays contain values. The no. of values is different for each symbol. Both arrays (datetime & double) are always of the same size.

Access to external database must be possible from different terminals.
Adjustment of the parameters on the external source/database must be able by an administrator, i.e. change parameter values, add and delete parameters.

Deliverables of the job

•          External source for the parameters to be defined – webpage, database, etc. Inputs for different options and recommendations how to realize the function best are required from programmer.
• Inputs for different options and recommendations how to realize the function best are required from programmer. 
•             Programming of the function used in the EA in mql4 based on the description above. See also attached picture for illustration.
• Preparing / programming of code for the external source in a way that only adding the sets of parameters for different symbols required.
• Demonstrate and explain the functionality of the program. Explain source code in mql4 in more detail if required.
• Support with the setup if the external source and connection to function in mql4.
• Delivery of all source codes.