eget: don't add duplicate URL with the same CID

bin/tools_eget

@@ -703,6 +703,11 @@ put_cid_and_url()
 
     is_fileurl "$URL" && return
 
+    local ac="$(get_url_by_cid)"
+    if [ "$ac" = "$URL" ] ; then
+        info "CID $CID is already exist as the same URL $URL in IPFS DB, skipping"
+        return
+    fi
     echo "$URL $CID $FN" >> "$EGET_IPFS_DB"
     info "Placed in $EGET_IPFS_DB: $URL $CID $FN"
 }