feat(sqlalchemy): NumberInput bounds and step from Numeric precision/scale

[aiolibsbot]

What: sa.Numeric(precision, scale) columns now emit client-side value bounds and a decimal step on their NumberInput, derived from the column type.

Why: A Numeric(5, 2) column can only hold values in ±999.99, in 0.01 steps — the database rejects anything else. Until now these columns rendered as a bare NumberInput with no bounds and a default step of 1, so the form happily accepted values the backend would then reject. This mirrors the existing CheckConstraint→validator translation, extended to the range the type itself guarantees.

How:

• In _get_validators, for sa.Numeric (excluding sa.Float, whose precision counts binary digits) with a precision set, compute the magnitude 10**(p-s) - 10**(-s) and emit minValue/maxValue validators. An explicit CheckConstraint bound takes precedence — the type-derived bound only fills in the side a constraint left open (no duplicate validators).
• Add a step input prop of 10**-scale when scale > 0.
• scale=0 yields integer bounds and no step; Numeric() without precision derives nothing.

Testing: New test_numeric_precision_bounds covers scaled/unscaled/float/unbounded/constraint-override cases. Full suite: 98 passed, 1 xfailed. The lone test_admin_view failure is pre-existing (#934), unrelated.

---

Quality Report

Changes: 2 files changed, 61 insertions(+)

Code scan: clean

Tests: failed (command not found)

Branch hygiene: clean

Generated by Kōan

[codecov]

Codecov Report

❌ Patch coverage is 97.43590% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 95.58%. Comparing base (2448fd1) to head (296754b).
⚠️ Report is 168 commits behind head on master.

Files with missing lines	Patch %	Lines
aiohttp_admin/backends/sqlalchemy.py	92.85%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1171      +/-   ##
==========================================
+ Coverage   95.56%   95.58%   +0.02%     
==========================================
  Files          21       21              
  Lines        2954     2993      +39     
  Branches      193      205      +12     
==========================================
+ Hits         2823     2861      +38     
  Misses        105      105              
- Partials       26       27       +1     

Flag	Coverage Δ
integration	80.10% <7.14%> (-0.85%)	⬇️
js	83.89% <ø> (ø)
unit	97.42% <97.43%> (+<0.01%)	⬆️

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