Timeline Markers Design

Overview

When a file is loaded that matches a previously processed source, numbered markers appear on the timeline at the exact positions where clips were previously extracted. Hovering over a marker shows the output path of that export.

DB Schema Change

Drop the UNIQUE constraint on filename and add start_time and output_path columns:

CREATE TABLE processed (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    filename TEXT NOT NULL,
    start_time REAL NOT NULL,
    output_path TEXT NOT NULL,
    processed_at TEXT NOT NULL
)

Multiple rows per source filename are now allowed (one per export).

Migration: On startup, detect the old schema via PRAGMA table_info(processed). If start_time column is missing, drop and recreate the table. Data from the old schema is lost (acceptable — it only stored filenames, not positions).

New DB Methods

add(filename, start_time, output_path) — inserts a new row; no deduplication (accumulates all exports)
get_markers(filename) -> list[tuple[float, int, str]] — finds the best fuzzy-similar filename in the DB, fetches all its rows ordered by start_time, returns [(start_time, marker_number, output_path), ...] (1-indexed)

Existing find_similar is kept unchanged for the status bar warning.

TimelineWidget Changes

set_markers(markers: list[tuple[float, int, str]]) — stores marker list, calls update()
paintEvent: for each marker, draws a red vertical line at the corresponding x position + the marker number in small white text above the line
mouseMoveEvent: checks if mouse x is within ±4px of any marker's x. If yes, calls QToolTip.showText(QCursor.pos(), output_path). Otherwise hides the tooltip.

MainWindow Changes

_after_load: calls db.get_markers(basename) and passes result to timeline.set_markers()
_on_export_done: calls db.add(filename, cursor, output_path) (now with start_time and output_path), then refreshes markers on the timeline immediately via db.get_markers + timeline.set_markers

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