Remove database implementation chapter

rfc/0003 RFC GraphQL API for Duniter Clients.md

@@ -339,33 +339,6 @@ Variables:
 ## Duniter Server module
 
 The GraphQL API is added on the server as a Duniter module.
-As this module add cpu and network charge on the Duniter node, it is optional.
-
-### New NoSQL Database
-
-The good practice to handle data in databases, is:
-
-- To use **relational database** to **write normalized data** (very fast to update an entity as entities are in separate tables).
-- To use **document database (NoSQL database)** to **request denormalized data** (very fast as all entities information are agregated in one document).
-
-So the module will:
-
-- **Write normalized data** in the Duniter database as usual.
-- **Write denormalized json documents** in a dedicated document database.
-
-- **Search/Request denormalized json documents** from the dedicated document database.
-
-We need to create a new database, handling **denormalized json documents** (NoSQL Database).
-
-Since version 3.9, **Sqlite3** has an extension (**json1**) to handle json documents:
-
-https://sqlite.org/json1.html
-
-http://charlesleifer.com/blog/using-the-sqlite-json1-and-fts5-extensions-with-python/
-
-So we don't need another database software dependency.
-
-The module will create another Sqlite3 file `gva_documents.db` to keep things well separated.
 
 ### ENDPOINTS format