LLM Oneshot Prompts, Oneshotted Apps, and Cursor Rules (C#/Rust/TS)

docs/.cursor/rules/spacetimedb.mdc

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+---
+description: "⛔ MANDATORY: Core SpacetimeDB concepts (all languages)."
+globs: **/*.ts,**/*.tsx,**/*.js,**/*.jsx,**/*.rs,**/*.cs
+alwaysApply: true
+---
+# SpacetimeDB Rules (All Languages)
+
+## Core Concepts
+
+1. **Reducers are transactional** — they do not return data to callers
+2. **Reducers must be deterministic** — no filesystem, network, timers, or random
+3. **Read data via tables/subscriptions** — not reducer return values
+4. **Auto-increment IDs are not sequential** — gaps are normal, don't use for ordering
+5. **`ctx.sender` is the authenticated principal** — never trust identity args
+
+---
+
+## Index System
+
+SpacetimeDB automatically creates indexes for:
+- Primary key columns
+- Columns marked as unique
+
+You can add explicit indexes on non-unique columns for query performance.
+
+**Index names must be unique across your entire module (all tables).** If two tables have indexes with the same declared name → conflict error.
+
+**Schema ↔ Code coupling:**
+- Your query code references indexes by name
+- If you add/remove/rename an index in the schema, update all code that uses it
+- Removing an index without updating queries causes runtime errors
+
+---
+
+## Editing Behavior
+
+- Make the smallest change necessary
+- Do NOT touch unrelated files, configs, or dependencies
+- Do NOT invent new SpacetimeDB APIs — use only what exists in docs or this repo
+- Do NOT add restrictions the prompt didn't ask for — if "users can do X", implement X for all users

docs/llms/oneshots/GRADE_SUMMARY.md

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+# LLM One-Shot Benchmark Summary
+
+**Generated:** 2026-01-28
+**Total Runs:** 13
+
+## Overall Results by Backend
+
+| Backend | Runs | Avg Score | Best | Worst |
+|---------|------|-----------|------|-------|
+| SpacetimeDB | 7 | 91.7% | 100.0% | 76.0% |
+| PostgreSQL | 6 | 62.7% | 76.4% | 41.7% |
+
+**SpacetimeDB advantage:** +29.0 percentage points
+
+## Results by LLM
+
+| LLM | STDB Runs | STDB Avg | PG Runs | PG Avg | Delta |
+|-----|-----------|----------|---------|--------|-------|
+| gemini-3-pro | 1 | 85.4% | 1 | 71.9% | +13.5% |
+| gpt-5-2 | 1 | 100.0% | 1 | 41.7% | +58.3% |
+| grok-code | 1 | 76.0% | 1 | 46.9% | +29.1% |
+| opus-4-5 | 4 | 95.1% | 3 | 72.0% | +23.1% |
+
+## Results by App
+
+| App | STDB Runs | STDB Avg | PG Runs | PG Avg | Delta |
+|-----|-----------|----------|---------|--------|-------|
+| chat-app | 7 | 91.7% | 6 | 62.7% | +29.0% |
+
+## All Runs
+
+| App | LLM | Backend | Date | Score | % |
+|-----|-----|---------|------|-------|---|
+| chat-app | gemini-3-pro | PG | 2026-01-08 | 17.25/24 | 71.9% |
+| chat-app | gemini-3-pro | STDB | 2026-01-07 | 20.5/24 | 85.4% |
+| chat-app | gpt-5-2 | PG | 2026-01-08 | 10/24 | 41.7% |
+| chat-app | gpt-5-2 | STDB | 2026-01-07 | 24/24 | 100.0% |
+| chat-app | grok-code | PG | 2026-01-28 | 11.25/24 | 46.9% |
+| chat-app | grok-code | STDB | 2026-01-07 | 18.25/24 | 76.0% |
+| chat-app | opus-4-5 | PG | 2026-01-04 | 27.5/36 | 76.4% |
+| chat-app | opus-4-5 | PG | 2026-01-04 | 27.25/36 | 75.7% |
+| chat-app | opus-4-5 | PG | 2026-01-04 | 23/36 | 63.9% |
+| chat-app | opus-4-5 | STDB | 2026-01-05 | 36/36 | 100.0% |
+| chat-app | opus-4-5 | STDB | 2026-01-02 | 32.5/36 | 90.3% |
+| chat-app | opus-4-5 | STDB | 2026-01-02 | 34.5/36 | 95.8% |
+| chat-app | opus-4-5 | STDB |  | 34/36 | 94.4% |

docs/llms/oneshots/chat-app/GRADE_SUMMARY.md

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+# chat-app Benchmark Summary
+
+**Generated:** 2026-01-28
+**Total Runs:** 13
+
+## Results by Backend
+
+| Backend | Runs | Avg Score | Best | Worst |
+|---------|------|-----------|------|-------|
+| SpacetimeDB | 7 | 91.7% | 100.0% | 76.0% |
+| PostgreSQL | 6 | 62.7% | 76.4% | 41.7% |
+
+## Results by LLM
+
+| LLM | STDB Runs | STDB Avg | PG Runs | PG Avg | Delta |
+|-----|-----------|----------|---------|--------|-------|
+| gemini-3-pro | 1 | 85.4% | 1 | 71.9% | +13.5% |
+| gpt-5-2 | 1 | 100.0% | 1 | 41.7% | +58.3% |
+| grok-code | 1 | 76.0% | 1 | 46.9% | +29.1% |
+| opus-4-5 | 4 | 95.1% | 3 | 72.0% | +23.1% |
+
+## Feature Scores (Average)
+
+| Feature | Max | STDB Avg | PG Avg | Winner |
+|---------|-----|----------|--------|--------|
+| 1. Basic Chat Features | 3 | 2.79 | 1.71 | STDB |
+| 2. Typing Indicators | 3 | 2.93 | 2.50 | STDB |
+| 3. Read Receipts | 3 | 3.00 | 1.58 | STDB |
+| 4. Unread Message Counts | 3 | 2.86 | 1.33 | STDB |
+| 5. Scheduled Messages | 3 | 2.36 | 1.75 | STDB |
+| 6. Ephemeral/Disappearing Messages | 3 | 2.64 | 2.67 | PG |
+| 7. Message Reactions | 3 | 2.89 | 1.79 | STDB |
+| 8. Message Editing with History | 3 | 2.93 | 1.83 | STDB |
+| 9. Real-Time Permissions | 3 | 2.25 | 1.58 | STDB |
+| 10. Rich User Presence | 3 | 2.88 | 2.67 | STDB |
+| 11. Message Threading | 3 | 3.00 | 2.00 | STDB |
+| 12. Private Rooms & Direct Messages | 3 | 3.00 | 2.17 | STDB |
+| 13. Room Activity Indicators | 3 | 0.00 | - | - |
+| 14. Draft Sync | 3 | 0.00 | - | - |
+| 15. Anonymous to Registered Migration | 3 | 0.00 | - | - |
+
+## All Runs
+
+| LLM | Backend | Date | Score | % | Level |
+|-----|---------|------|-------|---|-------|
+| gemini-3-pro | PG | 2026-01-08 | 17.25/24 | 71.9% | 5 |
+| gemini-3-pro | STDB | 2026-01-07 | 20.5/24 | 85.4% | 5 |
+| gpt-5-2 | PG | 2026-01-08 | 10/24 | 41.7% | 5 |
+| gpt-5-2 | STDB | 2026-01-07 | 24/24 | 100.0% | 5 |
+| grok-code | PG | 2026-01-28 | 11.25/24 | 46.9% | 5 |
+| grok-code | STDB | 2026-01-07 | 18.25/24 | 76.0% | 5 |
+| opus-4-5 | PG | 2026-01-04 | 27.5/36 | 76.4% | 9 |
+| opus-4-5 | PG | 2026-01-04 | 27.25/36 | 75.7% | 9 |
+| opus-4-5 | PG | 2026-01-04 | 23/36 | 63.9% | 9 |
+| opus-4-5 | STDB | 2026-01-05 | 36/36 | 100.0% | 9 |
+| opus-4-5 | STDB | 2026-01-02 | 32.5/36 | 90.3% | 9 |
+| opus-4-5 | STDB | 2026-01-02 | 34.5/36 | 95.8% | 9 |
+| opus-4-5 | STDB |  | 34/36 | 94.4% | 9 |