fix: stabilize history timestamps and telemetry docs (#100)

* fix: stabilize history timestamps and telemetry docs

* fix: preserve numeric epoch cursors in history SQLite queries

Normalize mixed ISO and unixepoch time values for incremental resume and scoped dedup so legacy numeric rows are not dropped by julianday filters.

Co-authored-by: Cursor <cursoragent@cursor.com>

* Bump version to v1.1.2

* fix: aggregate incremental start timestamps in SQLite

Use MAX on the normalized time expression with GROUP BY so incremental
resume loaders stay O(groups) instead of materializing every history row.

Co-authored-by: Cursor <cursoragent@cursor.com>

* test: parametrize duplicated incremental-start cases in TestIncrementalStart

Co-authored-by: Cursor <cursoragent@cursor.com>

---------

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/api/index.md

@@ -18,6 +18,8 @@ responsibilities.
 | [SDK](sdk.md)                             | Module-level fetch helpers, multi-account collectors, incremental history |
 | [Trading](trading.md)                     | Trading-capable sessions and operational helpers                          |
 | [History Collection (SQLite)](history.md) | SQLite schema, incremental writes, dedup, and rate views                  |
+| [Telemetry](telemetry.md)                 | OpenTelemetry metrics setup, meters, and emitted metric names             |
+| [Grafana](grafana.md)                     | Grafana-ready SQLite schema, views, snapshots, and published copies       |
 | [CLI](cli.md)                             | Typer commands that delegate to the Python API                            |
 | [Utils](utils.md)                         | Parsing helpers and Click parameter types                                 |