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KtorZ
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# Issue Number

<!-- Put here a reference to the issue this PR relates to and which requirements it tackles -->

#713 

# Overview

<!-- Detail in a few bullet points the work accomplished in this PR -->

- [x] I have added a StakeDistribution table
- [x] I have added two operations for reading and putting stake distributions to DB
- [x] I have added two basic properties for the operations above.

# Comments

<!-- Additional comments or screenshots to attach if any -->

```
  Sqlite
    Stake Pool properties
      readStakeDistribution . putStakeDistribution == pure
        +++ OK, passed 100 tests (4% Empty distributions).
      readStake . putStake a1 . putStake s0 == pure a1
        +++ OK, passed 100 tests:
         6% b is empty
         4% a is empty
         3% a & b are empty
```

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store 'StakeDistribution' in the database, implement put & read ops 
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KtorZ
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bors r+
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KtorZ
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bors r+
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KtorZ
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bors r+
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