fix process_piece_deal multiples

[snadrus]

A SQL mistake left SPs with multiple functions of this shape, which results in errors in indexing.
Lets delete them all and put back the one we want.

[Copilot]

Pull request overview

Removes duplicated process_piece_deal stored procedure/function definitions that were causing indexing errors, and recreates a single canonical process_piece_deal function.

Changes:

• Drops all existing process_piece_deal overloads found in pg_proc.
• Recreates process_piece_deal with the desired signature and upsert/insert behavior for market_piece_metadata and market_piece_deal.

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