feat(db): update indexes and add nbtc_withdrawal

[robert-zaremba]

Description

• removed unncecessary indexes
• added timestamp to indexes when relevant
• added withdraw table.

Summary by Sourcery

Refine the BTC indexer schema by cleaning up obsolete indexes, enhancing existing indexes with timestamps, and introducing the nbtc_withdrawal table to support withdrawal tracking.

New Features:

• Add nbtc_withdrawal table to track nBTC withdrawal transactions from SUI to BTC

Enhancements:

• Remove redundant indexes (e.g., processed_blocks_height) from nbtc_txs and processed_blocks tables
• Augment nbtc_txs_sui_recipient index with created_at timestamp for more efficient queries

[sourcery-ai]

Reviewer's Guide

This PR refactors existing database indexes by removing redundant single-column indexes and introducing timestamp-inclusive composite indexes, and introduces a new nbtc_withdrawal table to track nBTC withdrawal transactions.

Entity relationship diagram for updated nBTC tables

erDiagram
    nbtc_txs {
        TEXT tx_id PK
        TEXT sui_recipient
        INTEGER status
        INTEGER created_at
        INTEGER updated_at
    }
    nbtc_withdrawal {
        TEXT sui_tx_id PK
        TEXT sender
        INTEGER amount
        TEXT recipient
        TEXT note
        INTEGER sent_at
        TEXT btc_tx_id
        INTEGER status
    }
    processed_blocks {
        INTEGER height PK
        INTEGER processed_at
    }
    %% Relationships (if any) are not explicit in schema, so not shown

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Class diagram for new nbtc_withdrawal table

classDiagram
    class nbtc_withdrawal {
        +TEXT sui_tx_id
        +TEXT sender
        +INTEGER amount
        +TEXT recipient
        +TEXT note
        +INTEGER sent_at
        +TEXT btc_tx_id
        +INTEGER status
    }

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Class diagram for updated nbtc_txs indexes

classDiagram
    class nbtc_txs {
        +TEXT tx_id
        +TEXT sui_recipient
        +INTEGER status
        +INTEGER created_at
        +INTEGER updated_at
        <<INDEX>> status
        <<INDEX>> sui_recipient, created_at
    }

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Class diagram for updated processed_blocks indexes

classDiagram
    class processed_blocks {
        +INTEGER height
        +INTEGER processed_at
        <<INDEX REMOVED>> height
    }

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File-Level Changes

Change	Details	Files
Refactor existing indexes to include timestamps and remove redundancies	Dropped processed_blocks(height) index Removed single-column nbtc_txs(sui_recipient) index Added composite index on nbtc_txs(sui_recipient, created_at)	packages/btcindexer/db/migrations/0001_initial_schema.sql
Add nbtc_withdrawal table for tracking withdrawal lifecycle	Defined nbtc_withdrawal schema with sui_tx_id, sender, amount, recipient, note, sent_at, btc_tx_id, status Created composite index on (sender, recipient, sent_at) Documented status codes for withdrawal stages	packages/btcindexer/db/migrations/0001_initial_schema.sql

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[Copilot]

Pull Request Overview

This PR refactors database indexes and adds support for nBTC withdrawals. The changes optimize index structure by adding timestamp-based sorting and remove unnecessary indexes.

• Optimizes existing indexes by adding timestamp columns for better query performance
• Adds a new nbtc_withdrawal table to track withdrawal transactions from SUI to Bitcoin
• Removes two redundant indexes on processed blocks and updates the recipient index structure

[sourcery-ai]

Hey @robert-zaremba - I've reviewed your changes and they look great!

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[sczembor]

pre-approve