docs(timestamp): document timestamp as delivery/feed-freshness (OpticOdds-parity) + bump 0.5.0

The API now emits a single per-odd `timestamp` (delivery / last-refreshed,
advances every ingest cycle, matching OpticOdds), replacing odds_changed_at/
last_seen_at/wire_received_at. The SDK already modeled `timestamp` (was always
null); this clarifies its semantics on OddsLine + ArbitrageLeg. No model change.

Refs SHA-1048
Type: docs
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: paperclip-resolver[bot]

CHANGELOG.md

@@ -2,6 +2,17 @@
 
 All notable changes to the `sharpapi` Python SDK are documented here.
 
+## 0.5.0 — 2026-06-02
+
+### Changed
+
+- `OddsLine.timestamp` / `ArbitrageLeg.timestamp` documented as the **delivery /
+  last-refreshed** feed-freshness timestamp (advances every ingest cycle),
+  matching OpticOdds' `timestamp` — NOT a price-last-changed time. The API now
+  populates this field (previously always `null`). The removed
+  `odds_changed_at` / `last_seen_at` / `wire_received_at` were never modeled by
+  this SDK, so no model change is needed. (SHA-1048)
+
 ## 0.4.0 — 2026-05-31
 
 ### Added

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "sharpapi"
-version = "0.4.0"
+version = "0.5.0"
 description = "Official Python SDK for the SharpAPI real-time sports betting odds API"
 readme = "README.md"
 license = "MIT"

src/sharpapi/models.py

@@ -219,6 +219,9 @@ class OddsLine(BaseModel):
     probability: float
     line: float | None = None
     event_start_time: str | None = None
+    # ISO 8601 — when SharpAPI last refreshed this odd through its pipeline
+    # (advances every ingest cycle). A feed-freshness / delivery signal matching
+    # OpticOdds' `timestamp`; NOT a price-last-changed time. (SHA-1048)
     timestamp: str | None = None
     is_live: bool = False
     # True (default) = market open and bettable; False = market suspended/closed
@@ -315,6 +318,8 @@ class ArbitrageLeg(BaseModel):
     odds_decimal: float
     implied_probability: float | None = None
     stake_percent: float
+    # ISO 8601 last-refreshed (feed-freshness) timestamp for this leg's odd —
+    # see OddsLine.timestamp. (SHA-1048)
     timestamp: str | None = None
     external_event_id: str | None = None
     selection_id: str | None = None