Include partial index for transactions.asset (v3)

[sebastijankuzner]

Expected Behavior

Database should save transaction with very big assets even if they are too big to be indexed.

Current Behavior

Database rejects big multi-payment transactions if asset is too big to be properly indexed, which result in error:

ERROR: Could not save 101 blocks to database : QueryFailedError: index row size 3120 exceeds btree version 4 maximum 2704 for index "transactions_asset"
    at new QueryFailedError (/home/sebastijan.kuzner/core/node_modules/typeorm/error/QueryFailedError.js:11:28)
    at Query.<anonymous> (/home/sebastijan.kuzner/core/node_modules/typeorm/driver/postgres/PostgresQueryRunner.js:176:38)
    at Query.handleError (/home/sebastijan.kuzner/core/node_modules/pg/lib/query.js:146:19)
    at Connection.connectedErrorMessageHandler (/home/sebastijan.kuzner/core/node_modules/pg/lib/client.js:233:17)
    at Connection.emit (events.js:315:20)
    at /home/sebastijan.kuzner/core/node_modules/pg/lib/connection.js:109:10
    at Parser.parse (/home/sebastijan.kuzner/core/node_modules/pg-protocol/dist/parser.js:42:17)
    at Socket.<anonymous> (/home/sebastijan.kuzner/core/node_modules/pg-protocol/dist/index.js:8:42)
    at Socket.emit (events.js:315:20)
    at addChunk (_stream_readable.js:295:12)

Possible Solution

Implement partial index for transactions assets.