have street maps where i have following features:
1. Street center line (with object data attribute about street segment)
2. Street node where i must specify trough which node i must force rout, and which node i must avoid.
I must have data i dwg where i have original map and topology data stored in SQL database where i must change map restriction for each specific day (depending on work on some roads, which road will be close this day)

Questions are:
1.How to organize that each time when i ask for route, route topology will be read from database records - not from dwg file?
2. How to maintain database record if i add new node or new street, because i must add just new records to database and keep all olds data in database?

Any idea or recommendations?
Data in database must be stored using FDO DataStore!