Add database schema, ERD, and repository layer

internal/database/download_file_repository.go

@@ -0,0 +1,104 @@
+package database
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+type DownloadFile struct {
+	ID         string
+	DownloadID string
+	TrackID    *string
+	FilePath   string
+	FileSize   int64
+	FileType   string
+	SHA256Hash string
+	VerifiedAt *time.Time
+	CreatedAt  time.Time
+}
+
+type DownloadFileRepository struct {
+	pool *pgxpool.Pool
+}
+
+func NewDownloadFileRepository(pool *pgxpool.Pool) *DownloadFileRepository {
+	return &DownloadFileRepository{pool: pool}
+}
+
+func (r *DownloadFileRepository) Create(ctx context.Context, f *DownloadFile) error {
+	err := r.pool.QueryRow(ctx,
+		`INSERT INTO download_files (download_id, track_id, file_path, file_size, file_type, sha256_hash)
+		 VALUES ($1, $2, $3, $4, $5, $6)
+		 RETURNING id, created_at`,
+		f.DownloadID, f.TrackID, f.FilePath, f.FileSize, f.FileType, f.SHA256Hash,
+	).Scan(&f.ID, &f.CreatedAt)
+	if err != nil {
+		return fmt.Errorf("creating download file: %w", err)
+	}
+	return nil
+}
+
+func (r *DownloadFileRepository) CreateBatch(ctx context.Context, files []*DownloadFile) error {
+	for _, f := range files {
+		if err := r.Create(ctx, f); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (r *DownloadFileRepository) GetByDownloadID(ctx context.Context, downloadID string) ([]*DownloadFile, error) {
+	rows, err := r.pool.Query(ctx,
+		`SELECT id, download_id, track_id, file_path, file_size, file_type, sha256_hash, verified_at, created_at
+		 FROM download_files WHERE download_id = $1 ORDER BY file_path`, downloadID,
+	)
+	if err != nil {
+		return nil, fmt.Errorf("listing download files: %w", err)
+	}
+	defer rows.Close()
+
+	var files []*DownloadFile
+	for rows.Next() {
+		f := &DownloadFile{}
+		if err := rows.Scan(&f.ID, &f.DownloadID, &f.TrackID, &f.FilePath, &f.FileSize, &f.FileType, &f.SHA256Hash, &f.VerifiedAt, &f.CreatedAt); err != nil {
+			return nil, fmt.Errorf("scanning download file: %w", err)
+		}
+		files = append(files, f)
+	}
+	return files, nil
+}
+
+func (r *DownloadFileRepository) SetHash(ctx context.Context, id string, hash string) error {
+	_, err := r.pool.Exec(ctx,
+		`UPDATE download_files SET sha256_hash = $1, verified_at = NOW() WHERE id = $2`, hash, id,
+	)
+	if err != nil {
+		return fmt.Errorf("setting file hash: %w", err)
+	}
+	return nil
+}
+
+func (r *DownloadFileRepository) GetUnverified(ctx context.Context) ([]*DownloadFile, error) {
+	rows, err := r.pool.Query(ctx,
+		`SELECT id, download_id, track_id, file_path, file_size, file_type, sha256_hash, verified_at, created_at
+		 FROM download_files WHERE sha256_hash IS NULL OR verified_at < NOW() - INTERVAL '30 days'
+		 ORDER BY created_at`,
+	)
+	if err != nil {
+		return nil, fmt.Errorf("listing unverified files: %w", err)
+	}
+	defer rows.Close()
+
+	var files []*DownloadFile
+	for rows.Next() {
+		f := &DownloadFile{}
+		if err := rows.Scan(&f.ID, &f.DownloadID, &f.TrackID, &f.FilePath, &f.FileSize, &f.FileType, &f.SHA256Hash, &f.VerifiedAt, &f.CreatedAt); err != nil {
+			return nil, fmt.Errorf("scanning download file: %w", err)
+		}
+		files = append(files, f)
+	}
+	return files, nil
+}