examples: move the bundled BTCUSDT datasets to a top-level examples/data/

The seven BTCUSDT OHLCV datasets used to live under
crates/wickra/examples/data/, which buried them inside a Rust crate even
though the Node backtest example and the upcoming Rust/Node/WASM example
restructure need to reach them too. Move them to the workspace-level
examples/data/ so every language's examples can resolve the same path.

The bench (crates/wickra/benches/indicators.rs), the example_data
integration test, fetch_btcusdt.rs and the Node backtest example all take
the new ../../examples/data/ path; Data-Layer.md, examples/README.md and
the CHANGELOG entry are updated to match. No data file content changes.

CHANGELOG.md

@@ -39,10 +39,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Community health files: `CONTRIBUTING.md`, `SECURITY.md`,
   `CODE_OF_CONDUCT.md`, issue / pull-request templates, `CODEOWNERS`, and a
   Dependabot configuration.
-- Seven example OHLCV datasets under `crates/wickra/examples/data/`, one per
-  timeframe (1m / 5m / 15m / 1h / 12h / 1d / 1month), holding real BTCUSDT
-  spot klines, alongside the `fetch_btcusdt` example that regenerates them
-  from the Binance REST API.
+- Seven example OHLCV datasets under `examples/data/`, one per timeframe
+  (1m / 5m / 15m / 1h / 12h / 1d / 1month), holding real BTCUSDT spot klines,
+  alongside the `fetch_btcusdt` example that regenerates them from the
+  Binance REST API.
 - `Timeframe::minutes`, `Timeframe::hours` and `Timeframe::days` convenience
   constructors, each building on seconds with a checked-multiplication
   overflow guard.

bindings/node/examples/backtest.js

@@ -26,15 +26,13 @@ const wickra = require('..');
 // every one of them (any extra columns are ignored).
 const REQUIRED_COLUMNS = ['timestamp', 'open', 'high', 'low', 'close', 'volume'];
 
-// Default dataset: the checked-in BTCUSDT daily candles under
-// crates/wickra/examples/data/, resolved relative to this file.
+// Default dataset: the checked-in BTCUSDT daily candles under the workspace
+// `examples/data/` directory, resolved relative to this file.
 const DEFAULT_CSV = path.join(
   __dirname,
   '..',
   '..',
   '..',
-  'crates',
-  'wickra',
   'examples',
   'data',
   'btcusdt-1d.csv',

crates/wickra/benches/indicators.rs

@@ -6,14 +6,14 @@
 //! ```
 //!
 //! Each benchmark feeds real BTCUSDT 1-minute candles — read from the
-//! checked-in dataset `examples/data/btcusdt-1m.csv` — through both the
-//! streaming (`update` loop) and batch APIs of an indicator. Sizes cover
-//! small (1 000), medium (10 000), and large (50 000) workloads, taken as
-//! prefixes of that dataset.
+//! checked-in dataset at the workspace `examples/data/btcusdt-1m.csv` —
+//! through both the streaming (`update` loop) and batch APIs of an
+//! indicator. Sizes cover small (1 000), medium (10 000), and large
+//! (50 000) workloads, taken as prefixes of that dataset.
 //!
 //! Regenerate the dataset with:
 //! ```text
-//! cargo run -p wickra --example fetch_btcusdt
+//! cargo run -p wickra-examples --bin fetch_btcusdt
 //! ```
 
 use criterion::{black_box, criterion_group, criterion_main, BenchmarkId, Criterion, Throughput};
@@ -26,13 +26,17 @@ use wickra_data::csv::CandleReader;
 /// Workload sizes, in candles. Each is taken as a prefix of the dataset.
 const SIZES: &[usize] = &[1_000, 10_000, 50_000];
 
-/// Load the checked-in BTCUSDT 1-minute candle dataset.
+/// Load the checked-in BTCUSDT 1-minute candle dataset from the workspace
+/// `examples/data/` directory.
 fn load_candles() -> Vec<Candle> {
-    let path = concat!(env!("CARGO_MANIFEST_DIR"), "/examples/data/btcusdt-1m.csv");
+    let path = concat!(
+        env!("CARGO_MANIFEST_DIR"),
+        "/../../examples/data/btcusdt-1m.csv"
+    );
     let mut reader = CandleReader::open(path).unwrap_or_else(|e| {
         panic!(
             "could not open the benchmark dataset {path}: {e}\n\
-             generate it with `cargo run -p wickra --example fetch_btcusdt`"
+             generate it with `cargo run -p wickra-examples --bin fetch_btcusdt`"
         )
     });
     reader

crates/wickra/examples/fetch_btcusdt.rs

@@ -2,8 +2,9 @@
 //! and write them as CSV datasets under `examples/data/`.
 //!
 //! These are the datasets the indicator benchmarks (`benches/indicators.rs`)
-//! and the `example_data` integration test run against. Re-run this example
-//! to refresh them with the latest market history:
+//! and the `example_data` integration test run against. They live at the
+//! workspace `examples/data/` directory. Re-run this example to refresh
+//! them with the latest market history:
 //!
 //! ```text
 //! cargo run -p wickra --example fetch_btcusdt
@@ -96,6 +97,8 @@ fn main() -> Result<(), Box<dyn Error>> {
         .map_err(|_| "system clock is beyond the i64 millisecond range")?;
 
     let data_dir = PathBuf::from(env!("CARGO_MANIFEST_DIR"))
+        .join("..")
+        .join("..")
         .join("examples")
         .join("data");
     std::fs::create_dir_all(&data_dir)?;

crates/wickra/tests/example_data.rs

@@ -2,11 +2,11 @@
 //! hold enough rows, and carry strictly increasing — and, for the fixed
 //! timeframes, evenly spaced — timestamps.
 //!
-//! The datasets live in `examples/data/` and are produced by the
-//! `fetch_btcusdt` example. Regenerate them with:
+//! The datasets live in the workspace `examples/data/` directory and are
+//! produced by the `fetch_btcusdt` example. Regenerate them with:
 //!
 //! ```text
-//! cargo run -p wickra --example fetch_btcusdt
+//! cargo run -p wickra-examples --bin fetch_btcusdt
 //! ```
 
 use wickra_data::csv::CandleReader;
@@ -26,7 +26,7 @@ const DATASETS: &[(&str, usize, Option<i64>)] = &[
 ];
 
 fn dataset_path(file: &str) -> String {
-    format!("{}/examples/data/{file}", env!("CARGO_MANIFEST_DIR"))
+    format!("{}/../../examples/data/{file}", env!("CARGO_MANIFEST_DIR"))
 }
 
 #[test]

docs/wiki/Data-Layer.md

@@ -159,10 +159,9 @@ cargo run -p wickra-data --example live_binance --features live-binance
 ## Example datasets
 
 The repository ships seven ready-to-use OHLCV datasets under
-`crates/wickra/examples/data/`, one per timeframe, holding real Binance
-**BTCUSDT** spot candles in the standard `timestamp,open,high,low,close,volume`
-layout the `CandleReader` reads. The timestamp is each candle's open time in
-milliseconds.
+`examples/data/`, one per timeframe, holding real Binance **BTCUSDT** spot
+candles in the standard `timestamp,open,high,low,close,volume` layout the
+`CandleReader` reads. The timestamp is each candle's open time in milliseconds.
 
 | File | Timeframe | Rows |
 | --- | --- | --- |

examples/README.md

@@ -10,7 +10,7 @@ live here under [`python/`](python/).
 | Example | What it does | Run |
 | --- | --- | --- |
 | `backtest.rs` | Compute a basket of indicators over an OHLCV CSV and print a summary. | `cargo run -p wickra --example backtest -- <ohlcv.csv>` |
-| `fetch_btcusdt.rs` | Download real BTCUSDT klines from the Binance REST API into `crates/wickra/examples/data/`. | `cargo run -p wickra --example fetch_btcusdt` |
+| `fetch_btcusdt.rs` | Download real BTCUSDT klines from the Binance REST API into `examples/data/`. | `cargo run -p wickra --example fetch_btcusdt` |
 | `live_binance.rs` | Stream live Binance klines through an indicator over a resilient WebSocket. | `cargo run -p wickra-data --example live_binance --features live-binance` |
 
 ## Python — `examples/python/`
@@ -42,7 +42,7 @@ Build the native module first: `cd bindings/node && npm install && npx napi buil
 
 ## Example datasets
 
-`crates/wickra/examples/data/` holds seven real BTCUSDT OHLCV datasets, one
+`examples/data/` holds seven real BTCUSDT OHLCV datasets, one
 per timeframe (1m, 5m, 15m, 1h, 12h, 1d, 1month), in the standard
 `timestamp,open,high,low,close,volume` layout. The Rust and Node backtest
 examples and the indicator benchmarks run against them. Regenerate them with