Correctly handle Pages cached in DB

[ubeF]

Wanted behavior:

• Search utilizes cached data
• Continues search on "unexpanded" cached pages on the correct level

Current behavior:

• search algorithm hits cached node -> issues path search via neo4j:
  • path found: returns path
  • no path found: completely ignores node and it's branches in further search
• consequence: wont find certain routes

Possible fix:

• trigger recursive relabeling when cached node was hit, updating depths along it's branches
• "unexpanded" nodes along those branches can be used in further search

[ubeF]

This approach turns out to be more complex than expected. I will fix the issue temporarily by forcing removing old data on startup