Fixing PostgreSQL dump creation

[gzsombor]

Fixing #5728

• Format boolean values to true/false even when it is returned as byte-slice,
• Fix the sequence generation, the proper sequence name is used (instead of 'table_id_seq'), and fix the next value be max+1 always

[codecov-io]

Codecov Report

Merging #5747 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5747      +/-   ##
==========================================
- Coverage   37.76%   37.75%   -0.01%     
==========================================
  Files         325      325              
  Lines       47681    47681              
==========================================
- Hits        18005    18003       -2     
- Misses      27081    27084       +3     
+ Partials     2595     2594       -1

Impacted Files	Coverage Δ
models/unit.go	0% <0%> (-14.29%)	⬇️

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