Add since-mode

[egregors]

since-mode is counting and showing numbers of days since last mentation of our favorite themes.

It may be two option probably: catch themes buzz words in the messages, or use /since_ command.

For example:

user: ну вообще, ООП решает эту проблему
vldc_bot: This is are 0 days since ООП discussion

or

user: современный php – не такой плохой язык, им вполне можно пользоваться
user2: /since_php
vldc_bot: This is are 2 days since Современный ПеХеПе discussion

For these two options, we need the preselected list of our favorite themes.
Alternativly, we may allow users creating they owns since-words, like:

user: да макось вообще не позволяет ничего кастомизировать, толи дело арч
user2: /since бест ОС евер
vldc_bot: This is are 0 days since бест ОС евер discussion

В таком случае можно добавить вывод всех since за все время:

user: /since_all
vldc_bot:
ООП: 0 days
Современный ПеХеПе: 20 days
бест ОС евер: 2 days

Obviously, we need some persistent storage for this kind of stuff. Let's say it will be mongo

• add skill
• add adapter for persistent storage
  • add compose to run bot + storage
  • add .env file for configuration compose (token, chat name, mongo stuff)
  • add mongo into compose (everything become better with mongo)
  • add mongo driver to requirements
  • some way to backups? neh
• update docs | readme | cmd info in the come skill
• since cmd
• since_all cmd

[C-Pro]

stateless but with persistent storage? what do you mean?

[egregors]

I mean, I don't wanna store any state in the bot container \ instance. At this case, I believe we may use something like Cloud Firestore Do we love Google, hah?

[C-Pro]

We totally can, but I do not think we shoud. It would be way easier to fire up mongo alongside bot instance via docker-compost
We do not need firebase features like scalability, offline syncronization, realtime updates, network hiccups, occasional unexpected money spending or quota-reaching :)

[egregors]

Make sense. I'll change the issue description.