Problems with installation, uninstallation

[IvanPF]

I am working on several extensions at the same time. Reactions is one of them. At the moment there is no release date.

Removing the extension manually does not depend only on what the extension creates. phpBB creates additional records.

The extension generates the following:
- The acp module. It can be deleted from ACP > System.
- Tables in DB: phpbb_reactions, phpbb_reactions_data
- Columns in other tables:
- phpbb_posts: post_reaction_score
- phpbb_topics: topic_reaction_score

- In table phpbb_acl_options, all records have "reactions" in their "auth_option"
- In table phpbb_config, all records have "reactions" in their "config_key"

Records generated by phpBB:
- In phpbb_ext, the record with ext_name "canidev/reactions"
- In phpbb_migrations, the records related to "\canidev\reactions"

Hello, I have the same problem as previously described, I can't enable the extension, same SQL error:
SQL ERROR [ mysqli ]
Duplicate entry 'canidev/reactions' for key 'ext_name' [1062]
SQL
INSERT INTO phpbbws_ext (ext_name, ext_active, ext_state) VALUES ('canidev/reactions', 0, 's:13:\"notifications\";')

I have another CaniDev extension (attachments) and I didn't had any problems with that one, only with cBB Reactions. What can I do to enable it and use it in my forum? Thanks in advance.