Merge Request - Дьяченко Максим#1

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prsntday wants to merge 18 commits intoartsofte-php-course:masterfrom

prsntday:master

Commits on Nov 20, 2021

update project
EliteHacker228
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update sql support
EliteHacker228
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Commits on Nov 21, 2021

add buchgalteric table
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add buchgalteric table 2
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add form for new sells registration
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add form for new sells registration
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Commits on Nov 22, 2021

Add sells adding
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Commits on Nov 23, 2021

Add contracts adding
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Refactor sells adding page
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Add contracts system + fixes
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Commits on Nov 24, 2021

Commits on Dec 10, 2021

add CSS styling to the webpages
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refactoring of controllers
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fix 404 errors handling
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refactoring of errors handling and entities creation
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Commits on Dec 18, 2021

rework of contracts- and tables-error handlers
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