Parquet archive visibility and scheduled compaction#162
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erikdarlingdata merged 1 commit intodevfrom Feb 19, 2026
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) Display queries now read from views that UNION hot DuckDB tables with archived parquet files, so users can see the full 90-day retention window instead of only the 7-day hot data window. Views are created at startup and refreshed after each archive cycle. Adds daily database compaction to prevent file bloat from DuckDB's append-only storage. Compaction exports all tables to a fresh database via ATTACH/CREATE TABLE AS, swaps files, and recreates indexes/views. Includes a 1GB size watchdog that logs warnings between compaction cycles. Tested: 24/24 — archive round-trip (export to parquet, delete hot rows, verify view still returns all rows) and compaction (19MB → 5MB, all 1055 rows preserved across 25 tables). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This was referenced Feb 19, 2026
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Feb 19, 2026
Three fixes for "DuckDBOpen failed: Cannot open file" errors introduced by PR #159 (checkpoint) and PR #162 (compaction): 1. Timer initialization: DateTime.MinValue → DateTime.UtcNow prevents compaction/archival from firing on the very first collection cycle 2. Inline checkpoint: moved CHECKPOINT to end of RunDueCollectorsAsync using the existing connection pool instead of opening a separate DuckDB instance that conflicts via OS file locks 3. Atomic file swap: replaced two-step File.Move in CompactAsync with File.Replace (single OS operation, no window where the database file is missing) plus retry logic for locked files and WAL cleanup Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
v_views that UNION hot DuckDB tables with archived parquet files viaread_parquet()glob scans — users can see the full 90-day retention window instead of only the 7-day hot data window (Lite: Display queries should include archived parquet data #160)ATTACH/CREATE TABLE AS, swaps files, recreates indexes and views (Lite: Add scheduled database compaction to prevent DuckDB bloat #161)Closes #160, closes #161
Files changed
DuckDbInitializer.cs—CreateArchiveViewsAsync(),CompactAsync(), archive path + table listCollectionBackgroundService.cs— daily compaction timer, size watchdogArchiveService.cs— refresh views after archivalMainWindow.xaml.cs— pass DuckDbInitializer to background serviceLocalDataService.*.csfiles — queryv_views instead of raw tablesTest plan
dotnet build -c Debug— 0 warnings, 0 errorsv_views created successfully🤖 Generated with Claude Code