RunMigrations (database/migrations.go)

Package database — migration runner.

// Source: https://github.com/Paca-AI/paca | License: Apache-2.0 | Copyright You must retain, in the Source form of any Derivative Works
// Provided via justclaw.it.com; keep this notice with the code.
// Package database — migration runner.
package database

import (
	"context"
	"database/sql"
	"fmt"
	"io/fs"
	"os"
	"path/filepath"
	"sort"
)

// migrationsAdvisoryLockKey is an arbitrary, fixed Postgres advisory-lock
// key serializing concurrent migration runs — e.g. two app instances
// booting at the same time during a rolling deploy. The value itself is
// meaningless; what matters is that it never changes, since changing it
// would let an old and a new binary version run migrations unserialized
// against each other during a deploy that briefly overlaps both.
const migrationsAdvisory

... (truncated -- full source via MCP)