## Implementation Plan: Code Farm Anti-Grind Safeguards (Tier 1)

### Overview
Implement three coarse-grained rate and cooldown controls to eliminate the instantaneous harvest→plant loop and disrupt scripted DevII automation. Changes are confined to the enforcement layer; no data model or frontend modifications beyond a single nullable column.

### Changes by File

**1. `routers/game/index.py` (lines 60–74) — per-user rate limit in `_respond_action()`**

- Import `time` (if not already).
- Maintain a `dict` mapping `user_uid` to a list of timestamps (rolling window) or use `collections.deque`.
- Before processing the action, discard timestamps older than 60 seconds.
- If the number of remaining timestamps >= 30, return an HTTP 429 response (or similar) with a Retry-After header.
- Append current time after successful action processing.

**2. `routers/game/farm.py` — add same rate limit to water/steal handlers**

- Identify the route handlers for `water` and `steal` (likely functions like `water_plot`, `steal_crop`).  
- Apply identical rolling‑window logic as in `index.py`, scoped per `user_uid`.  
- Return appropriate throttle response if exceeded.

**3. `database/schema.py` (lines 983–1017, `game_plots` table) — add `cooldown_until` column**

- Add column `cooldown_until` of type `DateTime` (nullable, default `None`).  
- Generate and run a migration (or add via `alembic` if used; otherwise alter table directly).  
- If no migration framework exists, add the column via raw SQL `ALTER TABLE game_plots ADD COLUMN cooldown_until TIMESTAMP NULL;`.

**4. `services/game/store/actions.py` line 31 (`plant()`) — cooldown check**

- After fetching the plot (e.g., `plot = db.query(...)`), evaluate `plot.cooldown_until`:
  - If `cooldown_until` is not `None` and `datetime.utcnow() < cooldown_until`, raise a custom exception (or return an error dict) with message "Plot is on cooldown".
- Use the project's existing error‑reporting pattern (likely `store/errors.py` or inline).

**5. `services/game/store/actions.py` line 83 (`harvest()`) — set cooldown**

- After a successful harvest, update `plot.cooldown_until` to `datetime.utcnow() + timedelta(seconds=5)`.
- Commit the change.

**6. `services/devii/actions/catalog/game.py` — enable confirmation for high‑volume actions**

- Locate action definitions for `game_plant`, `game_harvest`, `game_fertilize`.
- Add a property or attribute `CONFIRM_REQUIRED = True` (or set it in the action schema).
- If the engine reads a specific field (e.g., `confirm_required`), set that field.
- Confirm that this flag causes the DevII runner to prompt the user before executing the action.

### Additional Note: Build Environment Workaround

The project’s `pip install` commands fail on system‑managed Python due to PEP 668. To make the verification commands reliable, modify the execution to set `PIP_REQUIRE_VIRTUALENV=0` or pass `--break-system-packages`. The plan below assumes the verification agent will prepend `BREAK_SYSTEM_PACKAGES=1` or similar.

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## Definition of Done

All the following conditions must be satisfied:

- [ ] **Rate‑limit logic is implemented** in `routers/game/index.py` and `routers/game/farm.py`, correctly rejecting requests exceeding 30 POSTs per 60‑second window per `user_uid`.
- [ ] **Cooldown column exists** in the `game_plots` table (`cooldown_until` nullable datetime). If a migration is required, it has been applied.
- [ ] **`plant()` checks cooldown** and rejects the action if the plot is still on cooldown (returns error / raises exception).
- [ ] **`harvest()` sets cooldown** to current UTC time + 5 seconds after successful harvest.
- [ ] **`game_plant`, `game_harvest`, `game_fertilize` DevII actions have `CONFIRM_REQUIRED = True`** set in `services/devii/actions/catalog/game.py`.
- [ ] **Lint passes**: `pip install --break-system-packages -q ruff && ruff check .` exits with code 0.
- [ ] **Unit tests pass**: `pip install --break-system-packages -e '.[dev]' -q && make test-unit` exits with code 0.
- [ ] **No syntax errors** in all modified files (can be verified with `python3 -m py_compile <file>` for each touched file).

### Verification Commands (as given)

```bash
# Install with --break-system-packages to bypass PEP 668
pip install --break-system-packages -e '.[dev]' -q && make test-unit
pip install --break-system-packages -q ruff && ruff check .
```