init ingestion

ingestion/ingest/internal/repo/pool.go

@@ -0,0 +1,33 @@
+package repo
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+// NewPool creates a pgxpool with sensible defaults for ingest workloads.
+// Pool size is small because ingest is mostly cache hits — Postgres is only
+// touched on cache miss (write key lookup, schema upsert).
+func NewPool(ctx context.Context, dsn string) (*pgxpool.Pool, error) {
+	cfg, err := pgxpool.ParseConfig(dsn)
+	if err != nil {
+		return nil, fmt.Errorf("parse pg dsn: %w", err)
+	}
+	cfg.MaxConns = 16
+	cfg.MinConns = 2
+	cfg.MaxConnIdleTime = 5 * time.Minute
+	cfg.HealthCheckPeriod = 30 * time.Second
+
+	pool, err := pgxpool.NewWithConfig(ctx, cfg)
+	if err != nil {
+		return nil, fmt.Errorf("pg connect: %w", err)
+	}
+	if err := pool.Ping(ctx); err != nil {
+		pool.Close()
+		return nil, fmt.Errorf("pg ping: %w", err)
+	}
+	return pool, nil
+}