Data deletion - LimnoLog

Last updated: 2026-08-31

LimnoLog (app available at app.limnolog.com, publisher: Bartłomiej Walczak / WalFamSystems) lets you delete your own data yourself, without contacting the administrator. Here's how, step by step.

1. Deleting individual data (measurements, sessions, projects)

Once logged in, you can delete any part of your research data without deleting your whole account:

• A measurement - in the data entry view (the "Entry" tab), from the action menu next to the value.
• A measurement session - in the project view, from the action menu next to the session.
• An entire project - in the project's Admin tab, using the delete-project option (available to the project owner).

Each of these takes effect immediately after you confirm it in the app, but they do not all go equally deep:

• Sessions and projects are removed permanently - the rows are deleted from the database together with everything that belongs to them.
• A measurement disappears from the app, and its row stays behind as an audit trace. A deleted measurement immediately stops being visible and stops feeding charts, analyses, reports and derived exports - but the row itself remains in the database, marked as deleted, and is included in the project's full backup. We do this because a measurement is part of the project's shared research record: hard-deleting a single value would break the integrity of other team members' series - the same reason we anonymise measurement authorship instead of deleting it when an account is closed (section 5).

The trace of a deleted measurement goes away together with the session or project it belonged to (deleting a project physically removes all of its measurements), and at the latest when your account is deleted and the backups expire - the windows are listed in section 5. If you want a specific measurement gone physically sooner, write to administrator@limnolog.com.

2. Deleting your entire account

To delete your account and profile, log in to the app and go to Settings → "Delete my account" (app.limnolog.com). After you confirm:

• Your profile is irreversibly anonymized (email address, name, password hash, preferences - replaced with anonymous data that can no longer be linked to you).
• Push notification subscriptions and technical telemetry are deleted, and your email address in historical delivery-log and invitation entries is anonymized.
• Measurements in projects you had access to are anonymized (the author is replaced with "Deleted user") - deleting your own profile does not delete research data belonging to other project members.
• If you also want to delete specific projects/sessions/measurements, do that before deleting your account (see section 1) - once the account is deleted you can no longer log in to do so.

3. Exporting your data before deletion (optional)

Under Settings → "Download my data (JSON)" you can first download a copy of your data (profile plus the list of projects you have access to) before deciding to delete it. Download session and station photos directly in the session/station view in the app before deleting your account.

4. If you can't log in to the app

If you want to delete your account entirely but for some reason can't access the app (e.g. lost access to your email, login issue), email administrator@limnolog.com. This is a last-resort contact channel, used only when self-service deletion in the app (section 2) isn't possible. We reply within 30 days.

5. What data is deleted, what is retained, and for how long

• Account data (email, name, password hash, language preferences) - irreversibly anonymized immediately when the account is deleted (replaced with anonymous data).
• Push notification subscriptions and technical telemetry - deleted immediately together with the account; your email address in historical delivery-log and invitation entries is anonymized.
• Measurements and sessions you authored - retained but anonymized (no link to your identity), so deleting your account doesn't break the research-data integrity for other project members. If you want specific measurements physically deleted (not just anonymized), delete them before deleting your account (section 1), or email administrator@limnolog.com.
• Activity log - entries without personal data are kept indefinitely (research-data audit integrity); entries containing personal data are anonymized together with account deletion.
• Projects inactive for 12 months (Free plan) - automatically deleted, with a warning email sent 30 and 7 days before deletion and a data export attached.
• Accounts inactive for 12 months with no active project (Free plan) - automatically anonymized, same as in section 2, with a warning email 30 and 7 days before.
• Email notifications - automatically deleted 90 days after being sent.
• Service backups - data deleted from the app may persist in encrypted backups for up to 35 days (database) or 90 days (file archive), after which it disappears as the backups are automatically deleted - see the Privacy policy §4b.

Full details on how we process your data: Privacy policy (binding version: Polish).