refactor: convert database queries to use Drizzle ORM

[devin-ai-integration]

Convert Database Queries to Use Drizzle ORM

This PR converts all database queries in the router files to use Drizzle ORM's type-safe query builders, replacing raw SQL queries.

Changes

• Replace raw SQL queries with type-safe Drizzle query builders
• Add proper null handling for numeric values (?? 0)
• Maintain consistent date/time string conversions
• Preserve existing query logic and frontend compatibility

GroupBy Statement Updates

• bundlers.ts:

  // From: .groupBy(sql`platform, time`)
  // To: .groupBy(sql`COALESCE(${bundlerHourlyMetrics.bundlerName}, 'unknown')\`, sql`time`)

• factories.ts:

  // From: .groupBy(sql`${factories.name}, time`)
  // To: .groupBy(factories.name, sql`time`)

• paymasters.ts:

  // From: .groupBy(sql`platform, time`)
  // To: .groupBy(sql`COALESCE(${paymasters.name}, 'unknown')\`, sql`time`)

• global-stats.ts:

  // From: .groupBy(sql`time, ${globalHourlyMetrics.chainId}`)
  // To: .groupBy(sql`time\`, globalHourlyMetrics.chainId)

Link to Devin run: https://app.devin.ai/sessions/f36d7319d9704224ba1059804c4256f0

[devin-ai-integration]

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