修改配置编辑不了的问题

backend/internal/postgres/runtime_settings.go

@@ -0,0 +1,88 @@
+package postgres
+
+import (
+	"context"
+	"fmt"
+	"sort"
+)
+
+const LoadRuntimeSettingsSQL = `
+SELECT setting_key, setting_value
+FROM platform_runtime_settings
+WHERE setting_key = ANY($1::text[])
+ORDER BY setting_key
+`
+
+const UpsertRuntimeSettingSQL = `
+INSERT INTO platform_runtime_settings (setting_key, setting_value)
+VALUES ($1, $2)
+ON CONFLICT (setting_key) DO UPDATE SET
+  setting_value = EXCLUDED.setting_value,
+  revision = platform_runtime_settings.revision + 1,
+  updated_at = now()
+`
+
+// LoadRuntimeSettings returns only the requested runtime setting keys. The
+// caller owns the editable-key whitelist; the database adapter owns storage.
+func (db *Database) LoadRuntimeSettings(ctx context.Context, keys []string) (map[string]string, error) {
+	if db.config.Backend != BackendPostgres || db.querier == nil {
+		return nil, fmt.Errorf("PostgreSQL is unavailable when ZHINIAN_DATA_BACKEND=%s", db.config.Backend)
+	}
+	if len(keys) == 0 {
+		return map[string]string{}, nil
+	}
+	rows, err := db.querier.Query(ctx, LoadRuntimeSettingsSQL, keys)
+	if err != nil {
+		return nil, fmt.Errorf("load runtime settings: %w", err)
+	}
+	defer rows.Close()
+	values := make(map[string]string, len(keys))
+	for rows.Next() {
+		var key, value string
+		if err := rows.Scan(&key, &value); err != nil {
+			return nil, fmt.Errorf("scan runtime setting: %w", err)
+		}
+		values[key] = value
+	}
+	if err := rows.Err(); err != nil {
+		return nil, fmt.Errorf("read runtime settings: %w", err)
+	}
+	return values, nil
+}
+
+// SaveRuntimeSettings atomically upserts a partial set of settings. Sorting
+// makes lock acquisition deterministic when concurrent requests touch several
+// keys at once.
+func (db *Database) SaveRuntimeSettings(ctx context.Context, values map[string]string) error {
+	if db.config.Backend != BackendPostgres || db.transactions == nil {
+		return fmt.Errorf("PostgreSQL is unavailable when ZHINIAN_DATA_BACKEND=%s", db.config.Backend)
+	}
+	if len(values) == 0 {
+		return nil
+	}
+	keys := make([]string, 0, len(values))
+	for key := range values {
+		keys = append(keys, key)
+	}
+	sort.Strings(keys)
+	tx, err := db.transactions.Begin(ctx)
+	if err != nil {
+		return fmt.Errorf("begin runtime settings update: %w", err)
+	}
+	finished := false
+	defer func() {
+		if !finished {
+			_ = tx.Rollback(ctx)
+		}
+	}()
+	for _, key := range keys {
+		if err := tx.Exec(ctx, UpsertRuntimeSettingSQL, key, values[key]); err != nil {
+			return fmt.Errorf("save runtime setting %s: %w", key, err)
+		}
+	}
+	if err := tx.Commit(ctx); err != nil {
+		return fmt.Errorf("commit runtime settings update: %w", err)
+	}
+	finished = true
+	return nil
+}