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+# Ollama Usage Poller — Continuous Collection
+
+## Context
+
+The `/usage` skill shows Ollama Cloud credit usage on demand. The user wants
+continuous collection: poll `GET https://ollama.com/api/usage` every minute,
+store a sample whenever anything changed since the last one. Goal: later
+analysis of how much each nanobot session cost, and when.
+
+Constraints found in exploration:
+
+- The API (`ollama.com/api/usage`, Bearer key from `workspace/.env`) returns:
+  `limits.session.usage` (fraction of plan limit, rolling 1-hour window),
+  `limits.weekly.usage` (weekly window), per-model `request_count` for both
+  windows, `activity.cost` (broken, always $0.00000 on Pro).
+- No reset timestamps, no per-model cost split, no token counts in the API.
+- Existing pattern: per-minute system crontab entries running `uv run <script>`
+  with output to `workspace/log/<name>_cron.log` (remind, wiki-compile,
+  wiki-sync). Reuse this pattern.
+- Session attribution later needs `memory/history.jsonl` (per-request
+  timestamps, token counts, session ids) — out of scope for this plan, this
+  plan only builds the collector + a delta report.
+
+## Steps
+
+1. **Collector** — `scripts/ollama_usage_poll.py` (English, stdlib only,
+   reuse `load_api_key` from `skills/usage/scripts/ollama_usage.py`):
+   - GET the API, on network/HTTP error log to stderr and exit 0
+     (never noisy, never blocks cron).
+   - SQLite `db/ollama_usage.sqlite`, table `samples`:
+     ```sql
+     CREATE TABLE IF NOT EXISTS samples (
+       ts       TEXT PRIMARY KEY,   -- UTC ISO 8601
+       session  REAL NOT NULL,      -- limits.session.usage fraction
+       weekly   REAL NOT NULL,      -- limits.weekly.usage fraction
+       models   TEXT NOT NULL       -- JSON: weekly {"model": count}
+     );
+     ```
+   - Write-on-change: compare against the latest row; insert only when
+     session, weekly, or models JSON differ. Unchanged minutes are noise.
+   - Session-window reset detection (usage drops instead of rising) is
+     implicit — we store raw values; deltas are computed at report time.
+
+2. **Crontab** — add system crontab entry (user's crontab, alongside the
+   existing ones):
+   ```
+   # ollama-usage: continuous usage sampling into db/ollama_usage.sqlite
+   * * * * * uv run /home/nanobot/.nanobot/workspace/scripts/ollama_usage_poll.py >> /home/nanobot/.nanobot/workspace/log/ollama_usage_cron.log 2>&1
+   ```
+
+3. **Report** — `scripts/ollama_usage_report.py` (English, stdlib only):
+   - No args: last 24 h delta summary (session/weekly spend per hour, model
+     request deltas).
+   - `--since ISO` / `--until ISO`: arbitrary window.
+   - Output: plain text table — for each consecutive sample pair:
+     `ts, Δsession %, Δweekly %, Δrequests per model`. Detect hourly reset
+     (session drops) and mark it as a new window boundary.
+   - Extend the `/usage` skill SKILL.md with a "Reports" section pointing
+     at this script (does not change the on-demand output format).
+
+4. **Skill update** — `skills/usage/SKILL.md`: add a short note that
+   continuous sampling runs via crontab into `db/ollama_usage.sqlite` and
+   reports are available via `scripts/ollama_usage_report.py`.
+
+5. **Git commit** — workspace repo, timestamped message.
+
+## Out of scope (later)
+
+- Session-level attribution (join with `memory/history.jsonl` token counts
+  per session) — separate plan once we have a few days of samples.
+- Notification thresholds (e.g. Telegram alert at 80 % weekly).
+- Retention/compaction of the samples table (1 row per change, negligible
+  size for months).
+
+## Verification
+
+1. Run `uv run scripts/ollama_usage_poll.py` twice back to back → second run
+   writes nothing (no change), DB has 1 row.
+2. Wait for a real request (or make one via nanobot) → next poll writes a
+   new row with changed session fraction / model counts.
+3. Run the report script → delta table renders, hourly reset detected as
+   boundary when a session window rolls over.
+4. `crontab -l` shows the new entry; after ~5 minutes `log/ollama_usage_cron.log`
+   is empty or minimal, DB grew.
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