fix: chart time-axis rendering, auto-detection, and MCP ergonomic fixes#39
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MCP servers communicate over stdio; their stderr goes to a client log pane (e.g. Claude Code output panel) that doesn't render ANSI codes. On Windows this produced raw escape sequences like [2m...[0m. Force plain text on both the daemon and MCP stderr layers. Also adds a pre-1.0 stability note to the README.
validate_output_path previously rejected paths whose parent directory didn't exist. Now it creates the directory tree (create_dir_all) before canonicalizing, so users don't need to pre-create output directories. Also improves chart tool description to guide LLMs on: - Long-format data requirement (one numeric y, use series for grouping) - x_as_category=true requirement for DATE/TIMESTAMP x-axes - UNION ALL reshaping for wide-format data
Line and scatter charts now peek at the first row's x value — if it's not numeric (DATE, TIMESTAMP, TEXT, etc.), categorical mode activates automatically. This eliminates the need to manually set x_as_category=true for date-based time series. The explicit x_as_category parameter still works as an override.
Categorical axis labels now go through a shortening pass: 1. Strip shared timezone offset (+00:00) when all labels end with it 2. Auto-thin: blank intermediate labels when they'd overlap based on estimated character width vs chart pixel width This prevents label collision on charts with 12+ TIMESTAMPTZ ticks at 800px width. First and last labels are always preserved.
…fix tick thinning Line and scatter charts now auto-detect DATE / TIMESTAMP / TIMESTAMPTZ x columns and render with a proportional time axis: real wall-clock gaps between data points are reflected on the chart's x-axis instead of being flattened to even spacing. Tick labels are formatted via chrono to match the input kind (%Y-%m-%d, %Y-%m-%d %H:%M:%S, or %Y-%m-%d %H:%M:%S%:z), with the originating offset captured from the first row preserved for TIMESTAMPTZ. Pass x_as_category: true to opt out and force the previous categorical layout; TEXT x columns continue to render categorically. Also fixes a tick-label thinning regression in the categorical path. The old shorten_labels blanked individual labels at non-step indices, but plotters picks its own tick positions on the float axis and rounds them to integer indices, so almost none of the chosen ticks landed on a kept index - a 90-point hourly TIMESTAMP series at any chart width rendered with only ONE visible x-axis label. The chart layer now computes a target tick count from chart width and label size, then passes it to plotters via .x_labels(N); every drawn tick carries a real label. Refactors: - shorten_labels split into strip_shared_tz_suffix (cosmetic +HH:MM compaction) and auto_tick_count (no-overlap budget for plotters). - group_series x_as_category: bool -> x_mode: XMode enum (Numeric / Categorical / Temporal(TemporalKind)). - New parse_temporal, format_temporal_tick, detect_line_x_mode, tick_count_for_label_width helpers. Tests: 16 new unit tests for the helpers (parse, format, detect, tick math, NaN safety, offset capture); 1 new integration test (line_chart_long_timestamp_series_renders_multiple_visible_labels) asserts >=3 visible date labels in the rendered SVG, locking in the regression fix. Total: 26 unit, 37 integration, all green; clippy --all-targets -D warnings clean. Docs: chart tool description in server.rs and LLM-facing readme.rs updated to document the new auto-detect behavior; CHANGELOG.md [Unreleased] gains two ### Fixed entries.
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Summary
x_as_category: trueto opt out.x_as_category=true; the chart peeks at the first row and activates categorical mode automatically.validate_output_pathnow callscreate_dir_allbefore canonicalizing, so users don't need to pre-create/tmp/charts/etc..with_ansi(false)prevents raw[0mnoise on Windows.Changed files
hyperdb-mcp/src/chart.rshyperdb-mcp/src/attach.rsvalidate_output_pathcreates parent dirshyperdb-mcp/src/main.rs.with_ansi(false)on stderr layershyperdb-mcp/src/server.rshyperdb-mcp/src/readme.rshyperdb-mcp/tests/chart_tests.rshyperdb-mcp/CHANGELOG.mdhyperdb-mcp/README.md.github/workflows/release-please.ymlREADME.mdTest plan
cargo clippy --workspace --tests -- -D warningscleancargo test -p hyperdb-mcp— all 37 integration + 26 unit chart tests pass/tmp/new-dir/out.pngauto-creates the directory