fix(history): fall back to Yahoo when Stockbit refuses the session

auto history picks Stockbit when a session file exists, so an expired
session failed history and technical with AUTHERROR. auto now retries on
Yahoo with a warning; an explicit --history-provider stockbit still fails.

Claude-Session: https://claude.ai/code/session_01RqPPVeVDrnLoP7NUZmLRxY

crates/idx-cli/tests/cli.rs

@@ -2197,6 +2197,51 @@ fn stockbit_login_stores_a_private_session_and_logout_removes_it() {
     assert!(!session.exists());
 }
 
+/// A session file Stockbit no longer accepts does not break `auto` history:
+/// it falls back to Yahoo with a warning. An explicit Stockbit choice fails.
+#[test]
+fn auto_history_falls_back_to_yahoo_when_the_session_is_refused() {
+    for args in [
+        &["stocks", "history", "BBCA", "--period", "1mo"][..],
+        &["stocks", "technical", "BBCA"][..],
+    ] {
+        let root = test_env_dir(&format!("stockbit-refused-{}", args[1]));
+        let output = mock_bin_with_root(&root)
+            .env("IDX_STOCKBIT_REFRESH_TOKEN", FAKE_STOCKBIT_TOKEN)
+            .env("IDX_MOCK_STOCKBIT_STATUS", "401")
+            .args(["-o", "json", "--provider", "stockbit"])
+            .args(args)
+            .output()
+            .expect("run history");
+        assert!(output.status.success(), "{args:?}: {output:?}");
+        let stderr = String::from_utf8_lossy(&output.stderr);
+        assert!(stderr.contains("falls back to yahoo"), "{stderr}");
+        serde_json::from_slice::<Value>(&output.stdout).expect("JSON on stdout");
+        let _ = fs::remove_dir_all(root);
+    }
+    let root = test_env_dir("stockbit-refused-explicit");
+    run_error_json(
+        mock_bin_with_root(&root)
+            .env("IDX_STOCKBIT_REFRESH_TOKEN", FAKE_STOCKBIT_TOKEN)
+            .env("IDX_MOCK_STOCKBIT_STATUS", "401")
+            .args([
+                "-o",
+                "json",
+                "--provider",
+                "stockbit",
+                "stocks",
+                "history",
+                "BBCA",
+            ])
+            .args(["--period", "1mo", "--history-provider", "stockbit"]),
+        "AUTHERROR",
+    );
+    let _ = fs::remove_dir_all(root);
+}
+
+/// A test session, signed by nobody, that expires in 2100.
+const FAKE_STOCKBIT_TOKEN: &str = "eyJhbGciOiJub25lIn0.eyJleHAiOiA0MTAyNDQ0ODAwLCAibm90ZSI6ICJ0ZXN0IHRva2VuLCBzaWduZWQgYnkgbm9ib2R5In0.c2ln";
+
 /// An agent on a headless box gets told how to log in, not "nothing pasted".
 #[test]
 fn stockbit_login_with_empty_stdin_says_how_to_log_in() {

crates/idx-core/src/analysis/mod.rs

@@ -128,9 +128,10 @@ impl Analysis<'_> {
         policy: CachePolicy,
     ) -> Result<Fetched<TechnicalReport>, IdxError> {
         let idx = self.idx;
+        let resolved = idx.resolve(symbol)?;
+        idx.market().with_history_fallback(source, |source| {
             let provider = history_provider(source.provider, idx.config.verbose);
             let bucket = format!("{}-technical", source.provider.as_str());
-        let resolved = idx.resolve(symbol)?;
             cached_fetch(
                 &idx.cache,
                 CacheSpec {
@@ -144,6 +145,7 @@ impl Analysis<'_> {
                 || provider.history(&resolved, &Period::OneYear, &Interval::Day),
                 |history| build_technical_report(&resolved, &history),
             )
+        })
     }
 
     pub fn growth(

crates/idx-core/src/api/mock.rs

@@ -143,7 +143,8 @@ impl HistoryProvider for MockProvider {
 /// `stockbit_exodus_chart_candle_<code>_<window>.json`, with the market state
 /// from `stockbit_exodus_market_session.json`. A code without a fixture is
 /// Stockbit's 404. `IDX_MOCK_STOCKBIT_STATUS` (e.g. `403`) answers that HTTP
-/// status instead, and `IDX_MOCK_ERROR` fails as for the other providers.
+/// status instead (`401` on the session API: Stockbit refused the session),
+/// and `IDX_MOCK_ERROR` fails as for the other providers.
 pub struct MockStockbitProvider;
 
 impl MockStockbitProvider {
@@ -178,6 +179,11 @@ impl MockStockbitProvider {
         if !stockbit::has_session() {
             return Err(IdxError::AuthError(stockbit::auth::NO_SESSION.to_string()));
         }
+        if std::env::var("IDX_MOCK_STOCKBIT_STATUS").as_deref() == Ok("401") {
+            return Err(IdxError::AuthError(
+                "Stockbit rejected the session; run `idx stockbit login` again".to_string(),
+            ));
+        }
         if let Some(err) = self.failure(symbol) {
             return Err(err);
         }

crates/idx-core/src/market.rs

@@ -127,10 +127,11 @@ impl Market<'_> {
         policy: CachePolicy,
     ) -> Result<Fetched<Vec<Ohlc>>, IdxError> {
         let idx = self.idx;
-        let provider = history_provider(source.provider, idx.config.verbose);
-        let bucket = format!("{}-history", source.provider.as_str());
         let resolved = idx.resolve(symbol)?;
         let key = format!("{resolved}-{}-{}", period.as_str(), interval.as_str());
+        self.with_history_fallback(source, |source| {
+            let provider = history_provider(source.provider, idx.config.verbose);
+            let bucket = format!("{}-history", source.provider.as_str());
             cached_fetch(
                 &idx.cache,
                 CacheSpec {
@@ -144,6 +145,31 @@ impl Market<'_> {
                 || provider.history(&resolved, period, interval),
                 Ok,
             )
+        })
+    }
+
+    /// Runs `fetch` on `source`; when `auto` picked Stockbit because a
+    /// session file exists and Stockbit then refuses that session, runs it
+    /// again on Yahoo instead of failing (`has_session` sees only the file).
+    pub(crate) fn with_history_fallback<T>(
+        &self,
+        source: HistorySource,
+        fetch: impl Fn(HistorySource) -> Result<Fetched<T>, IdxError>,
+    ) -> Result<Fetched<T>, IdxError> {
+        match fetch(source) {
+            Err(IdxError::AuthError(reason))
+                if source.mode == HistoryProviderKind::Auto
+                    && source.provider == ProviderKind::Stockbit =>
+            {
+                crate::runtime::warn(format!("{reason}; history falls back to yahoo meanwhile"));
+                fetch(HistorySource {
+                    provider: ProviderKind::Yahoo,
+                    is_fallback: self.idx.provider.kind() != ProviderKind::Yahoo,
+                    ..source
+                })
+            }
+            other => other,
+        }
     }
 
     /// The order book of one IDX stock from the user's Stockbit session,