[CONTRIBUTION] Add BEX (Berachain native DEX) to dex.trades on berachain

What I want to add BEX is Berachain's native DEX (a Balancer V2 fork) and is currently missing from dex.trades on berachain. The 3 protocols currently covered (kodiak, beraswap, burrbear) represent only ~$14M of weekly volume. BEX has significant additional volume that is completely invisible to the community.

Research I've done:

1. The BEX mainnet Vault contract is 0x4Be03f781C497A489E3cB0287833452cA9B9E80B
2. Dune has already decoded this contract as beraswap_berachain.vault_evt_swap, with live swap data confirmed today (May 2026)
3. The decoded table has columns: poolId, tokenIn, tokenOut, amountIn, amountOut — identical to the standard Balancer V2 Swap event
4. BEX uses the Balancer V2 Vault architecture, so balancer_compatible_v2_trades macro applies directly

Proposed implementation Create bex_berachain_base_trades.sql using balancer_compatible_v2_trades(blockchain='berachain', project='bex', version='2'), reading from beraswap_berachain.vault_evt_swap.

Question for the team:
Since the decoded source is named beraswap_berachain rather than bex_berachain, does the macro need a source alias, or should I reference beraswap_berachain directly as the source?

I'm ready to write the SQL as soon as this is confirmed.

Start with the proposed bex_berachain_base_trades.sql file and inspect the balancer_compatible_v2_trades macro, using the existing beraswap_berachain.vault_evt_swap source and its decoded Swap columns as the reference. Resolve whether the macro can reference that source directly or needs an alias; done means BEX swap activity is included in dex.trades on Berachain.