迁移 PostgreSQL 并新增 Python API 服务

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

web/backend/internal/store/futures.go

@@ -6,21 +6,22 @@ import (
 	"errors"
 	"fmt"
 	"strings"
+
+	_ "github.com/lib/pq"
 )
 
 var ErrMissingTsCode = errors.New("ts_code 必填")
 
 type FuturesStore struct{ db *sql.DB }
 
-func OpenFutures(path string) (*FuturesStore, error) {
-	dsn := fmt.Sprintf("file:%s?mode=ro&_pragma=query_only(true)", path)
-	db, err := sql.Open("sqlite", dsn)
+func OpenFutures(databaseURL string) (*FuturesStore, error) {
+	db, err := sql.Open("postgres", databaseURL)
 	if err != nil {
-		return nil, fmt.Errorf("open futures.db: %w", err)
+		return nil, fmt.Errorf("open futures db: %w", err)
 	}
-	db.SetMaxOpenConns(4)
+	db.SetMaxOpenConns(8)
 	if err := db.Ping(); err != nil {
-		return nil, fmt.Errorf("ping futures.db: %w", err)
+		return nil, fmt.Errorf("ping futures db: %w", err)
 	}
 	return &FuturesStore{db: db}, nil
 }