added logical-data-model.md and updated README.md to reference file (#…

…1682)

README.md

@@ -5,6 +5,7 @@ Provides an API over the Database of Qualified Teachers (DQT). Provides the core
 
 # High level architecture (showing one of the citizen facing services that make use of the TRS API)
 * [Teaching Record System High Level Architecture (just showing core components)](docs/c4-diagrams-as-code/trs-core-containers.jpg)
+* [Logical Data Model](docs/logical-data-model.md)
 
 # Data Integrations **
 TRS provides the the core teaching record data to a number of internal and external facing digital services:

docs/logical-data-model.md

@@ -0,0 +1,29 @@
+# Logical Data Model
+
+Logical representation of the key data entities and their relationships held within the Teaching Record System (TRS). To note, this does not represent how the data is stored physically.
+```mermaid
+---
+title: Teaching Record System (TRS) Logical Data Model
+---
+erDiagram
+  Person ||--|{ Professional-Status : "Can Hold"
+  Person ||--|{ Route-To-Professional-Status : "Could Take a"
+  Person ||--|{ Teaching-Qualifications : "Can Hold"
+  Person ||--|{ Teacher-training : "Can Take"
+  Person ||--|{ Teacher-Pension-Eligibility : "Normally has"
+  Teacher-Pension-Eligibility ||--|{ Employment : "Could be in"
+  Employment ||--|{ Educational-Establishment : "at a"
+  Educational-Establishment ||--|{ Provider : "Can be a"
+  Professional-Status }o--o{ Teaching-Qualifications  : "Can be a"
+  Route-To-Professional-Status ||--o{ Teacher-training : "Might Require"
+  Route-To-Professional-Status ||--o{ Induction : "Might Need To Complete an"
+  Route-To-Professional-Status ||--o{ Equivelence : "Might apply for"
+  Equivelence ||--o{ Professional-Status : "And be awarded"
+  Teacher-training ||--o{ Provider : "With a"
+  Induction||--o{ Professional-Status : "Before They are Awarded"
+  Teacher-training ||--o{ Teaching-Qualifications : "Can Lead To"
+  Teacher-training ||--o{ Teaching-Training-Type : "is a"
+  Provider ||--o{ Provider-Type : "is a"
+  Person ||--|{ Teaching-Alerts : "Can Have"
+  Teaching-Alerts ||--|{ Teaching-Sanction-Prohibition : "Can Result In"
+```