pg_class.reltuples is `real` (FLOAT4). Reading it as f64 via query_scalar made
the sample_data tool fail with a sqlx type-mismatch ("f64 (FLOAT8) is not
compatible with FLOAT4") before any rows were fetched. Decode as f32 and widen.
When connected to a Greenplum cluster, schema introspection now surfaces
the two attributes that dominate query performance there: the data
distribution policy (DISTRIBUTED BY / RANDOMLY) and the storage kind
(heap / AO row / AO column). Without these, the agent writes
PG-optimal SQL that triggers Redistribute Motion in GP and runs orders
of magnitude slower than necessary.
- track Greenplum major version (6 vs 7) at connect time, since GP6
uses pg_class.relstorage and GP7 dropped it in favor of pg_am
- new fetch_gp_table_extras helper queries gp_distribution_policy and
the version-appropriate storage catalog, returns a per-table map
- format_table_block prints ` -- GP: DISTRIBUTED BY (...) | STORAGE: ...`
under the TABLE header when extras are available
- build_overview_postgres appends a GREENPLUM NOTES block with the
distribution-aware-join rules and a skew-detection one-liner; the
agent sees this in every system prompt on a GP connection
- build_schema_context (legacy generate_sql / explain_sql / fix_sql_error
path) and the chat get_columns tool both feed extras into format_table_block
P0 of the GP support arc — partitioning, EXPLAIN motion-aware parsing,
external tables, resource queues, and a skew-check tool are deliberately
deferred to follow-up commits.
Removes enterprise/DBA features and replaces the marginal AI bar with a
central chat agent that has progressive-discovery tools, cross-session
memory, saved-query reuse, and inline result actions. Adds ClickHouse
support alongside PostgreSQL/Greenplum.
Cleanup
- Drop ~10k LOC of advanced features: Docker, Snapshots, Validation,
Index Advisor, Role/User Management, Data Generator, ERD, Lookup.
- Trim deps: drop @xyflow/react, dagre, @types/dagre; cut tokio features
to rt-multi-thread/sync/time/net/macros.
- Remove unused TuskError variants and dead helpers (topological_sort,
invalidate_schema_cache).
Multi-DB (PostgreSQL + ClickHouse)
- New src-tauri/src/db/ module: ChClient (HTTP-based, reuses reqwest),
sql_guard (cross-flavor read-only whitelist with 8 tests).
- ConnectionConfig gains db_flavor and secure fields with serde defaults
for backwards-compatible connections.json.
- All connection/query/schema/data commands dispatch by flavor; CH
covers connect, execute_query, list_databases/schemas/tables/views/
columns/completion_schema, paginated table fetch.
- Frontend: dbCapabilities matrix, ConnectionDialog engine selector
with port auto-swap and HTTPS toggle, SqlEditor switches to
StandardSQL dialect for CH, TableDataView surfaces CH connections as
read-only.
AI-first chat agent
- New src/components/chat/ panel with composer, message rendering,
collapsible tool-call/result blocks, top-level ErrorBoundary.
- Backend agent loop in commands/chat.rs with strict-JSON tool
protocol. Nine tools: list_databases, list_tables, get_columns,
switch_database, run_query, remember, save_query, find_queries, final.
Forgiving parser accepts both flat and nested-input shapes.
- Compressed history: only the last 4 run_query results carry sample
rows (≤10, cells truncated to 200 chars) into LLM context; older
results marked omitted.
- System prompt uses lite OVERVIEW (DB list + active-DB tables only)
instead of full DDL — schema details are loaded on demand via
get_columns. CH OVERVIEW shows cross-DB tables since CH allows
db.table queries.
Cross-session memory (F1)
- Per-connection markdown file at app_data_dir/memory/<connection_id>.md,
16KB cap with oldest-block eviction. Agent appends via remember()
tool; the file is injected into LEARNED NOTES section of every system
prompt.
- New Memory sidebar tab with editable textarea, badge for note count,
empty-state with template. Edits picked up on the next agent turn.
Saved-query reuse (F2)
- Tools save_query and find_queries scoped to current connection.
save_query attaches a UUID + timestamp; find_queries returns top 10
matches with SQL preview ≤500 chars.
- Storage shared with the sidebar Saved panel.
Inline result actions (F3)
- run_query result block in chat gets Open-full (90vw × 80vh modal with
full ResultsTable, no row cap) and Export (reuses ExportDialog for
CSV/JSON via existing exportCsv/exportJson commands).
Verification
- cargo check clean, zero warnings.
- cargo test --lib: 50 pass (20 chat parser + 4 memory + 8 sql_guard +
6 clean_sql + 12 escape_ident).
- npx tsc --noEmit clean.
- npx vitest run: 20 pass.
