docs: add stored procedure naming convention design

PLANS/2026-01-06-stored-procedure-naming-convention-design.md

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+# Stored Procedure Naming Convention Design
+
+## Goal
+
+Rename stored procedures to follow SQL Server best practice `usp_` prefix convention for consistency and clarity.
+
+## Current State
+
+| Current Name | Has `usp_` Prefix |
+|--------------|-------------------|
+| `SubmitSearch` | No |
+| `StartSearch` | No |
+| `CompleteSearch` | No |
+| `ResetPartialSearches` | No |
+| `usp_ValidateSearchCriteria` | Yes (already correct) |
+
+## Target State
+
+| Current | New |
+|---------|-----|
+| `SubmitSearch` | `usp_SubmitSearch` |
+| `StartSearch` | `usp_StartSearch` |
+| `CompleteSearch` | `usp_CompleteSearch` |
+| `ResetPartialSearches` | `usp_ResetPartialSearches` |
+
+## Implementation Approach
+
+### 1. SQL Scripts (Modify Existing)
+
+Update scripts 040-043 directly with new procedure names:
+
+- `040_CreateSubmitSearchProcedure.sql` → `usp_SubmitSearch`
+- `041_CreateStartSearchProcedure.sql` → `usp_StartSearch`
+- `042_CreateCompleteSearchProcedure.sql` → `usp_CompleteSearch`
+- `043_CreateResetPartialSearchesProcedure.sql` → `usp_ResetPartialSearches`
+
+### 2. Docker Database (Manual Update)
+
+Since DbUp won't re-run already-executed scripts:
+1. Drop old procedures from Docker database
+2. Execute updated CREATE statements directly
+
+### 3. C# Constants Class (New File)
+
+Create `StoredProcedures.cs` in `JdeScoping.DataAccess`:
+
+```csharp
+namespace JdeScoping.DataAccess;
+
+/// <summary>
+/// Constants for stored procedure names.
+/// </summary>
+public static class StoredProcedures
+{
+    public const string SubmitSearch = "usp_SubmitSearch";
+    public const string StartSearch = "usp_StartSearch";
+    public const string CompleteSearch = "usp_CompleteSearch";
+    public const string ResetPartialSearches = "usp_ResetPartialSearches";
+    public const string ValidateSearchCriteria = "usp_ValidateSearchCriteria";
+}
+```
+
+### 4. Repository Update
+
+Update `LotFinderRepository.SearchManagement.cs` to use constant:
+
+```csharp
+// Before
+await using var command = new SqlCommand("SubmitSearch", connection)
+
+// After
+await using var command = new SqlCommand(StoredProcedures.SubmitSearch, connection)
+```
+
+### 5. Documentation Updates
+
+Update all files mentioning procedure names:
+
+| File | Updates Needed |
+|------|----------------|
+| `DOCUMENTATION/Architecture/Testing.md` | Procedure references |
+| `DOCUMENTATION/Architecture/Database.md` | Procedure references |
+| `DOCUMENTATION/search_creation_page_new.md` | Procedure references |
+| OpenSpec specs | Any procedure references |
+| PLANS files | Historical references |
+
+## Files Changed
+
+| Category | Files |
+|----------|-------|
+| SQL Scripts | 4 files (040-043) |
+| C# New | 1 file (`StoredProcedures.cs`) |
+| C# Modified | 1 file (`LotFinderRepository.SearchManagement.cs`) |
+| Documentation | ~5 files |
+| Docker | Manual SQL execution |
+
+## Verification
+
+1. Build succeeds
+2. All existing tests pass
+3. Docker database has renamed procedures
+4. `SELECT name FROM sys.procedures` shows `usp_` prefix on all procedures