Update data-storage-model.md

Added info and diagrams for the genetic maps data storage model

_docs/curation/genetic-maps/data-storage-model.md

@@ -6,4 +6,24 @@ tags:
   - data storage
   - importers
 description: This is documentation pertaining to how genetic map data and QTLs are stored in the Chado database.
----
+---
+
+## Data Storage Model for Genetic Maps and QTLs
+
+### Genetic Maps
+Genetic maps and their corresponding metadata are stored in the following chado tables: `featuremap`, `featuremapprop`, `feature`, `featuremap_analysis`, `featureprop`, `featurepos` and `analysis`:
+
+- A map is created in the `featuremap` table whereas metadata regarding its description, population type and size are stored in `featuremapprop`
+- Methodology of how the map was created is stored in the `analysis` and `featuremap_analysis` tables
+- Each position in the map is a combination of the linkage group, locus and genetic marker (each are stored in the `feature` table) with the position itself stored in the `featurepos` table.
+
+![](https://tripal-qtl.readthedocs.io/en/latest/_images/MSTmap.datastorage.png)
+
+### QTLs
+QTL data are stored as expected by Tripal Map within the following chado tables: `featurepos` and `featureposprop`
+
+- It is assumed the map matches the format described for the MSTMap importer and that QTL features are located on that map using the `featurepos` table
+- The position stored in `featurepos` by the QTL Importer is the position of the QTL peak
+- The QTL peak is also stored in the `featureposprop` table along with the confidence interval values
+
+![](https://tripal-qtl.readthedocs.io/en/latest/_images/QTLimporter.datastorage.png)