[ 1642765 ] problem with Facc_act_balance slow financial report
Implemented a better approach (suggested by Heng Sin)
- Dropped Fact_Acct_Balance table
- Created Fact_Acct_Balance view for backward compatibility
- Created speed up index on Fact_Acct
- Replaced the accesses to Fact_Acct_Balance by accessing directly Fact_Acct in code
- Don't need to "update balances" anymore
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