feat(db): migrate from MySQL to PostgreSQL

Replace MySQL driver with pgx/v5 and pgxpool:
- Update sqlc to use postgresql engine
- Convert query.sql to PostgreSQL syntax ($1 params, CASE WHEN,
  ANY() arrays)
- Replace sql.DB with pgxpool.Pool throughout
- Change nullable types from sql.Null* to pgtype.*
- Update ID types from uint32 to int64 for PostgreSQL compatibility
- Delete MySQL-specific dynamic_connect.go
- Add opentelemetry.gowrap template for tracing

go.mod

@@ -15,14 +15,14 @@ tool (
 require (
 	dario.cat/mergo v1.0.2
 	github.com/ClickHouse/clickhouse-go/v2 v2.40.3
-	github.com/go-sql-driver/mysql v1.9.3
 	github.com/hashicorp/go-retryablehttp v0.7.8
+	github.com/jackc/pgx/v5 v5.7.6
 	github.com/labstack/echo-contrib v0.17.4
 	github.com/labstack/echo/v4 v4.13.4
 	github.com/samber/slog-echo v1.17.2
 	github.com/spf13/cobra v1.10.1
 	go.ntppool.org/api v0.3.4
-	go.ntppool.org/common v0.5.2
+	go.ntppool.org/common v0.6.3-0.20251129195245-283d3936f6d0
 	go.opentelemetry.io/contrib/instrumentation/github.com/labstack/echo/otelecho v0.63.0
 	go.opentelemetry.io/contrib/instrumentation/net/http/httptrace/otelhttptrace v0.63.0
 	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.63.0
@@ -53,6 +53,7 @@ require (
 	github.com/go-faster/errors v0.7.1 // indirect
 	github.com/go-logr/logr v1.4.3 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/go-sql-driver/mysql v1.9.3 // indirect
 	github.com/google/cel-go v0.24.1 // indirect
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.2 // indirect
@@ -63,7 +64,6 @@ require (
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
-	github.com/jackc/pgx/v5 v5.7.4 // indirect
 	github.com/jackc/puddle/v2 v2.2.2 // indirect
 	github.com/jinzhu/inflection v1.0.0 // indirect
 	github.com/klauspost/compress v1.18.0 // indirect
@@ -138,7 +138,7 @@ require (
 	golang.org/x/sys v0.36.0 // indirect
 	golang.org/x/text v0.29.0 // indirect
 	golang.org/x/time v0.13.0 // indirect
-	golang.org/x/tools v0.36.0 // indirect
+	golang.org/x/tools v0.37.0 // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20250922171735-9219d122eba9 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20250922171735-9219d122eba9 // indirect
 	google.golang.org/grpc v1.75.1 // indirect