fix: Migrating tables

[orronai]

• Added exception of exercise - course and number indexes migration

[codecov]

Codecov Report

Merging #342 (8005b23) into master (2c71ba3) will increase coverage by 0.05%.
The diff coverage is 0.00%.

❗ Current head 8005b23 differs from pull request most recent head 91fe85f. Consider uploading reports for the commit 91fe85f to get more accurate results

@@            Coverage Diff             @@
##           master     #342      +/-   ##
==========================================
+ Coverage   83.96%   84.02%   +0.05%     
==========================================
  Files          63       63              
  Lines        2950     2948       -2     
==========================================
  Hits         2477     2477              
+ Misses        473      471       -2     

Impacted Files	Coverage Δ
lms/lmsdb/bootstrap.py	15.65% <0.00%> (+0.13%)	⬆️

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[sourcery-ai]

Sourcery Code Quality Report

✅  Merging this PR will increase code quality in the affected files by 0.52%.

Quality metrics	Before	After	Change
Complexity	2.23 ⭐	1.96 ⭐	-0.27 👍
Method Length	48.33 ⭐	47.96 ⭐	-0.37 👍
Working memory	6.65 🙂	6.57 🙂	-0.08 👍
Quality	79.25% ⭐	79.77% ⭐	0.52% 👍

Other metrics	Before	After	Change
Lines	312	306	-6

Changed files	Quality Before	Quality After	Quality Change
lms/lmsdb/bootstrap.py	79.25% ⭐	79.77% ⭐	0.52% 👍

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
lms/lmsdb/bootstrap.py	_migrate_column_in_table_if_needed	6 ⭐	116 🙂	11 😞	59.05% 🙂	Extract out complex expressions
lms/lmsdb/bootstrap.py	_rename_column_in_table_if_needed	2 ⭐	104 🙂	10 😞	66.46% 🙂	Extract out complex expressions
lms/lmsdb/bootstrap.py	main	7 ⭐	136 😞	6 ⭐	66.65% 🙂	Try splitting into smaller methods
lms/lmsdb/bootstrap.py	_alter_column_type_if_needed	1 ⭐	93 🙂	10 😞	68.98% 🙂	Extract out complex expressions
lms/lmsdb/bootstrap.py	_migrate_copy_column	0 ⭐	62 🙂	10 😞	74.59% 🙂	Extract out complex expressions

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The 👍 and 👎 indicate whether the quality has improved or gotten worse with this pull request.

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