fix(chdb): scan ClickHouse log_scores into signed model fields

The PostgreSQL model migration regenerated LogScore.ID, MonitorID and
ServerID as signed/pgtype fields, but the ClickHouse log_scores columns
are unsigned (id UInt64, monitor_id/server_id UInt32). clickhouse-go
refuses to scan UInt64 into *int64, so every score row failed to parse
and the scores endpoints returned empty.

Scan each row into locals matching the ClickHouse column types, then
convert into the model, mirroring the existing leap handling. Factor the
shared scan into scanLogScore used by both Logscores and
LogscoresTimeRange.

chdb/logscores.go

@@ -2,16 +2,62 @@ package chdb
 
 import (
 	"context"
+	"database/sql"
 	"fmt"
 	"strings"
 	"time"
 
 	"github.com/ClickHouse/clickhouse-go/v2"
+	"github.com/jackc/pgx/v5/pgtype"
 	"go.ntppool.org/common/logger"
 	"go.ntppool.org/common/tracing"
 	"go.ntppool.org/data-api/ntpdb"
 )
 
+// scanLogScore reads one ClickHouse log_scores row into an ntpdb.LogScore.
+// The ClickHouse columns are unsigned (id UInt64, monitor_id/server_id UInt32,
+// rtt UInt32), but the PostgreSQL-generated model uses signed/pgtype fields, so
+// the row is scanned into locals matching the ClickHouse types and then converted.
+func scanLogScore(rows interface{ Scan(...any) error }) (ntpdb.LogScore, error) {
+	row := ntpdb.LogScore{}
+
+	var (
+		id        uint64
+		monitorID uint32
+		serverID  uint32
+		ts        time.Time
+		offset    sql.NullFloat64
+		rtt       sql.NullInt32
+		leap      uint8
+	)
+
+	if err := rows.Scan(
+		&id,
+		&monitorID,
+		&serverID,
+		&ts,
+		&row.Score,
+		&row.Step,
+		&offset,
+		&rtt,
+		&leap,
+		&row.Attributes.Warning,
+		&row.Attributes.Error,
+	); err != nil {
+		return row, err
+	}
+
+	row.ID = int64(id)
+	row.MonitorID = pgtype.Int8{Int64: int64(monitorID), Valid: true}
+	row.ServerID = int64(serverID)
+	row.Ts = pgtype.Timestamptz{Time: ts, Valid: true}
+	row.Offset = pgtype.Float8{Float64: offset.Float64, Valid: offset.Valid}
+	row.Rtt = pgtype.Int4{Int32: rtt.Int32, Valid: rtt.Valid}
+	row.Attributes.Leap = int8(leap)
+
+	return row, nil
+}
+
 func (d *ClickHouse) Logscores(ctx context.Context, serverID, monitorID int, since time.Time, limit int, fullHistory bool) ([]ntpdb.LogScore, error) {
 	log := logger.Setup()
 	ctx, span := tracing.Tracer().Start(ctx, "CH Logscores")
@@ -74,32 +120,12 @@ func (d *ClickHouse) Logscores(ctx context.Context, serverID, monitorID int, sin
 	rv := []ntpdb.LogScore{}
 
 	for rows.Next() {
-
+		row, err := scanLogScore(rows)
-		row := ntpdb.LogScore{}
+		if err != nil {
-
-		var leap uint8
-
-		if err := rows.Scan(
-			&row.ID,
-			&row.MonitorID,
-			&row.ServerID,
-			&row.Ts,
-			&row.Score,
-			&row.Step,
-			&row.Offset,
-			&row.Rtt,
-			&leap,
-			&row.Attributes.Warning,
-			&row.Attributes.Error,
-		); err != nil {
 			log.Error("could not parse row", "err", err)
 			continue
 		}
-
-		row.Attributes.Leap = int8(leap)
-
 		rv = append(rv, row)
-
 	}
 
 	// log.InfoContext(ctx, "returning data", "rv", rv)
@@ -138,7 +164,8 @@ func (d *ClickHouse) LogscoresTimeRange(ctx context.Context, serverID, monitorID
 		args = append(args, limit)
 	}
 
-	log.DebugContext(ctx, "clickhouse time range query",
+	log.DebugContext(
+		ctx, "clickhouse time range query",
 		"query", query,
 		"args", args,
 		"server_id", serverID,
@@ -181,31 +208,16 @@ func (d *ClickHouse) LogscoresTimeRange(ctx context.Context, serverID, monitorID
 	rv := []ntpdb.LogScore{}
 
 	for rows.Next() {
-		row := ntpdb.LogScore{}
+		row, err := scanLogScore(rows)
-		var leap uint8
+		if err != nil {
-
-		if err := rows.Scan(
-			&row.ID,
-			&row.MonitorID,
-			&row.ServerID,
-			&row.Ts,
-			&row.Score,
-			&row.Step,
-			&row.Offset,
-			&row.Rtt,
-			&leap,
-			&row.Attributes.Warning,
-			&row.Attributes.Error,
-		); err != nil {
 			log.Error("could not parse row", "err", err)
 			continue
 		}
-
-		row.Attributes.Leap = int8(leap)
 		rv = append(rv, row)
 	}
 
-	log.InfoContext(ctx, "time range query results",
+	log.InfoContext(
+		ctx, "time range query results",
 		"rows_returned", len(rv),
 		"server_id", serverID,
 		"monitor_id", monitorID,