Optimization of article read from FireStore DB

[dasBikash84]

Maintain a record of articles by page in real-time DB.

Create a top level node on real-time Db -> 'page_article_map' Under that node there will be child nodes for each page with data that specific child node for each page will contain a Map<articleId,publicationTime>

there will also be another top level node 'page_article_map_update_time'. It will contain a Map<pageId,lastUpdate_time> When ever back end parser adds news article for any page it will also update corresponding Map<articleId,publicationTime> and Map<pageId,lastUpdate_time> as per data. at android app this will also have to be coordinated.

[dasBikash84]

Work steps:

• [x] Add rules on real_time_DB as per plan
• [x] Modify article data bootstrap code on "dasBikash84/ns_reloaded_backendParser"
• [x] Modify init and fire_store data service code on android app to get in sync with new optimization scheme.