add batch remove batch split batch show hidden batches hide batch
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ebook_id name
1 Book 1
2 Book 2
tag_id name
1 tag 1
2 tag 2
4 tag 3
ebook_id tag_id
1 1
1 2
2 1
2 4

ebook_id name
2 Book 2
tag_id name
1 tag 1
4 tag 3
ebook_id tag_id
2 1
2 4