AI分析功能：LLM Key 改为数据库管理，支持管理员后台配置

web/backend/internal/store/ai.go

@@ -0,0 +1,134 @@
+package store
+
+import (
+	"database/sql"
+	"encoding/json"
+	"fmt"
+)
+
+// AnalysisContext 汇总一次 AI 分析所需的全部数据。
+type AnalysisContext struct {
+	Score        Score    `json:"score"`
+	Candles      []Candle `json:"candles"`
+	RecentScores []Score  `json:"recent_scores"`
+}
+
+// GetAnalysisContext 拉取指定合约某日的 score + 近 60 日 K 线 + 近 10 日 scores。
+func (s *FuturesStore) GetAnalysisContext(tsCode, tradeDate string) (*AnalysisContext, error) {
+	ctx := &AnalysisContext{}
+
+	// 1) 目标日 score（含 detail_json）
+	row := s.db.QueryRow(`SELECT id, ts_code, trade_date, close, oi, oi_chg, short_term, medium_term,
+		long_term, composite, signal, detail_json, created_at FROM scores
+		WHERE ts_code = $1 AND trade_date = $2`, tsCode, tradeDate)
+	var detail sql.NullString
+	if err := row.Scan(&ctx.Score.ID, &ctx.Score.TsCode, &ctx.Score.TradeDate,
+		&ctx.Score.Close, &ctx.Score.OI, &ctx.Score.OIChg,
+		&ctx.Score.ShortTerm, &ctx.Score.MediumTerm, &ctx.Score.LongTerm,
+		&ctx.Score.Composite, &ctx.Score.Signal, &detail, &ctx.Score.CreatedAt); err != nil {
+		return nil, fmt.Errorf("score not found: %w", err)
+	}
+	if detail.Valid {
+		ctx.Score.Detail = json.RawMessage(detail.String)
+	}
+
+	// 2) 近 60 日 K 线
+	rows, err := s.db.Query(`SELECT ts_code, trade_date,
+		COALESCE(NULLIF(open, 'NaN'::real), 0), COALESCE(NULLIF(high, 'NaN'::real), 0),
+		COALESCE(NULLIF(low, 'NaN'::real), 0), COALESCE(NULLIF(close, 'NaN'::real), 0),
+		COALESCE(NULLIF(vol, 'NaN'::real), 0), COALESCE(NULLIF(amount, 'NaN'::real), 0),
+		COALESCE(NULLIF(oi, 'NaN'::real), 0), COALESCE(NULLIF(oi_chg, 'NaN'::real), 0),
+		COALESCE(NULLIF(pre_close, 'NaN'::real), 0)
+		FROM candles WHERE ts_code = $1 AND trade_date <= $2
+		ORDER BY trade_date DESC LIMIT 60`, tsCode, tradeDate)
+	if err != nil {
+		return nil, fmt.Errorf("candles: %w", err)
+	}
+	defer rows.Close()
+	for rows.Next() {
+		var c Candle
+		if err := rows.Scan(&c.TsCode, &c.TradeDate, &c.Open, &c.High, &c.Low, &c.Close,
+			&c.Vol, &c.Amount, &c.OI, &c.OIChg, &c.PreClose); err != nil {
+			return nil, err
+		}
+		ctx.Candles = append(ctx.Candles, c)
+	}
+	// 反转回升序
+	for i, j := 0, len(ctx.Candles)-1; i < j; i, j = i+1, j-1 {
+		ctx.Candles[i], ctx.Candles[j] = ctx.Candles[j], ctx.Candles[i]
+	}
+
+	// 3) 近 10 日 scores（不含 detail_json 以减体积）
+	scoreRows, err := s.db.Query(`SELECT id, ts_code, trade_date, close, oi, oi_chg, short_term, medium_term,
+		long_term, composite, signal, created_at FROM scores
+		WHERE ts_code = $1 AND trade_date <= $2
+		ORDER BY trade_date DESC LIMIT 10`, tsCode, tradeDate)
+	if err != nil {
+		return nil, fmt.Errorf("recent scores: %w", err)
+	}
+	defer scoreRows.Close()
+	for scoreRows.Next() {
+		var sc Score
+		if err := scoreRows.Scan(&sc.ID, &sc.TsCode, &sc.TradeDate, &sc.Close, &sc.OI, &sc.OIChg,
+			&sc.ShortTerm, &sc.MediumTerm, &sc.LongTerm, &sc.Composite, &sc.Signal, &sc.CreatedAt); err != nil {
+			return nil, err
+		}
+		ctx.RecentScores = append(ctx.RecentScores, sc)
+	}
+	// 反转回升序
+	for i, j := 0, len(ctx.RecentScores)-1; i < j; i, j = i+1, j-1 {
+		ctx.RecentScores[i], ctx.RecentScores[j] = ctx.RecentScores[j], ctx.RecentScores[i]
+	}
+
+	return ctx, nil
+}
+
+// LLMConfig 数据库中的 LLM 配置单例。
+type LLMConfig struct {
+	BaseURL string `json:"base_url"`
+	APIKey  string `json:"api_key"`
+	Model   string `json:"model"`
+}
+
+// EnsureLLMConfigTable 建 llm_config 表（幂等）。
+func (s *FuturesStore) EnsureLLMConfigTable() error {
+	_, err := s.db.Exec(`
+		CREATE TABLE IF NOT EXISTS llm_config (
+			id       INTEGER PRIMARY KEY DEFAULT 1 CHECK(id = 1),
+			base_url TEXT NOT NULL DEFAULT 'https://api.deepseek.com/v1',
+			api_key  TEXT NOT NULL DEFAULT '',
+			model    TEXT NOT NULL DEFAULT 'deepseek-chat',
+			updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+		);
+		INSERT INTO llm_config (id) VALUES (1) ON CONFLICT DO NOTHING;
+	`)
+	return err
+}
+
+// GetLLMConfig 读取 LLM 配置，无记录返回零值。
+func (s *FuturesStore) GetLLMConfig() (*LLMConfig, error) {
+	cfg := &LLMConfig{}
+	err := s.db.QueryRow(`SELECT base_url, api_key, model FROM llm_config WHERE id = 1`).
+		Scan(&cfg.BaseURL, &cfg.APIKey, &cfg.Model)
+	if err != nil {
+		if err.Error() == "sql: no rows in result set" {
+			return cfg, nil
+		}
+		return nil, err
+	}
+	return cfg, nil
+}
+
+// SaveLLMConfig 写入 LLM 配置（upsert）。
+func (s *FuturesStore) SaveLLMConfig(cfg *LLMConfig) error {
+	_, err := s.db.Exec(`
+		INSERT INTO llm_config (id, base_url, api_key, model, updated_at)
+		VALUES (1, $1, $2, $3, CURRENT_TIMESTAMP)
+		ON CONFLICT (id) DO UPDATE SET
+			base_url = EXCLUDED.base_url,
+			api_key  = EXCLUDED.api_key,
+			model    = EXCLUDED.model,
+			updated_at = CURRENT_TIMESTAMP
+	`, cfg.BaseURL, cfg.APIKey, cfg.Model)
+	return err
+}