WeKnora deployment source with the reviewed wiki identity, summary and recovery fixes

internal/knowledgeversion/graph.go

@@ -0,0 +1,101 @@
+package knowledgeversion
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/json"
+	"time"
+
+	"github.com/Tencent/WeKnora/internal/types"
+	"gorm.io/gorm"
+)
+
+// GraphRecord retains original evidence IDs and payloads in each independent KB.
+type GraphRecord struct {
+	TenantID             uint64 `gorm:"primaryKey"`
+	KnowledgeBaseID      string `gorm:"primaryKey"`
+	SourceTable          string `gorm:"primaryKey"`
+	LegacyID             int64  `gorm:"primaryKey;autoIncrement:false"`
+	GraphVersionID       int64
+	Payload              types.JSON `gorm:"type:jsonb"`
+	SourceSnapshotSHA256 string     `gorm:"column:source_snapshot_sha256"`
+	ImportedAt           time.Time
+}
+
+func (GraphRecord) TableName() string { return "native_graph_records" }
+
+type GraphSource struct {
+	TenantID            uint64 `gorm:"primaryKey"`
+	KnowledgeBaseID     string `gorm:"primaryKey"`
+	SourceChunkID       string `gorm:"primaryKey"`
+	SourceFile          string
+	SourceContentHash   string
+	Excerpt             string
+	NativeKnowledgeID   *string
+	NativeChunkID       *string
+	NativeContentSHA256 *string `gorm:"column:native_content_sha256"`
+	MappingState        string
+}
+
+func (GraphSource) TableName() string { return "native_graph_sources" }
+
+func GraphTablesExist(db *gorm.DB) bool {
+	return db.Migrator().HasTable(&GraphRecord{}) && db.Migrator().HasTable(&GraphSource{})
+}
+
+// GraphFingerprint participates in approval conflict detection without exposing
+// source paths, legacy payloads or private document identifiers to reviewers.
+func GraphFingerprint(db *gorm.DB, tenant uint64, kb string) (string, error) {
+	if !GraphTablesExist(db) {
+		return "", nil
+	}
+	h := sha256.New()
+	count := 0
+	for _, item := range []struct {
+		model any
+		order string
+	}{
+		{&GraphRecord{}, "source_table, legacy_id"}, {&GraphSource{}, "source_chunk_id"},
+	} {
+		rows, err := db.Model(item.model).Where("tenant_id=? AND knowledge_base_id=?", tenant, kb).Order(item.order).Rows()
+		if err != nil {
+			return "", err
+		}
+		for rows.Next() {
+			var value any = &GraphRecord{}
+			if _, ok := item.model.(*GraphSource); ok {
+				value = &GraphSource{}
+			}
+			if err := db.ScanRows(rows, value); err != nil {
+				rows.Close()
+				return "", err
+			}
+			if err := json.NewEncoder(h).Encode(value); err != nil {
+				rows.Close()
+				return "", err
+			}
+			count++
+		}
+		err = rows.Err()
+		rows.Close()
+		if err != nil {
+			return "", err
+		}
+	}
+	if count == 0 {
+		return "", nil
+	}
+	return hex.EncodeToString(h.Sum(nil)), nil
+}
+
+func DeleteGraph(db *gorm.DB, tenant uint64, kb string) error {
+	if !GraphTablesExist(db) {
+		return nil
+	}
+	for _, model := range []any{&GraphSource{}, &GraphRecord{}} {
+		if err := db.Where("tenant_id=? AND knowledge_base_id=?", tenant, kb).Delete(model).Error; err != nil {
+			return err
+		}
+	}
+	return nil
+}