DB viewer + query editor enhancements (home-screen-ux-query-editor) (#4)

* feat: add query_history table migration (v5) (Task 1)

* feat: add isDestructiveQuery utility (Task 2)

* feat: add tabType discriminator and openQueryTab to dbViewerStore (Task 3)

* feat: add execute_query command with pagination and query history (Task 4)

* feat: add typed wrappers for executeQuery, getQueryHistory, clearQueryHistory (Task 5)

* fix: global search bypasses folder scope when filters active (Task 6)

* feat: add TagFilterDropdown with checkboxes and empty state (Task 7)

* feat: add DbTypeFilterDropdown with checkboxes and clear all (Task 8)

* feat: wire TagFilterDropdown/DbTypeFilterDropdown into ActionRow, add inline tag creation (Task 9)

* feat: add Name input to GeneralTab for connection editing (Task 10)

* feat: add QueryEditor Monaco wrapper with SQL mode and Cmd+Enter (Task 11)

* feat: add DestructiveQueryDialog with SQL preview and confirmation (Task 12)

* feat: integrate query tabs, Monaco editor, destructive guard into DbViewerScreen (Task 13)

* fix: harden moveConnection against race conditions on rapid drags (Task 14)

* docs: update AGENTS.md implementation status for Home Screen UX + Query Editor (Task 15)

* feat: switch tag filter to OR semantics, add environment filter (F-T16)

* feat: add activeEnvironment filter state to uiStore and useFilteredConnections (F-T17)

* feat: add environment filter select to Filters dropdown (F-T18)

* feat: filter folder cards by tag match or contained connections (F-T19)

* fix: keep grid header width to content, border last column

* fix: hide select-all checkbox and empty-state when no table open

* fix: filter folder cards by any active filter, show global search results (F-T20)

* feat: show 'Showing Search Results' breadcrumb with clear button (F-T21)

* docs: update README + AGENTS.md for Query Editor, filters, and planned AI integration (BYOK)

* feat: refresh indicator with spinning icon and pulse, defer auto-refresh on tab switch

* feat: smart default schema selection, refresh schemas on database switch

* fix: auto-refresh waits for in-flight refresh to complete before next tick

* style: shrink db viewer sidebar nav icons from 20px to 16px

* style: shrink db viewer sidebar nav buttons to 32px (8px padding)

* style: make Tables panel title xs, regular weight, muted

* style: bump Tables panel title back to sm, keep regular weight and muted

* feat: export schema diagram as PNG/JPEG/SVG (entire schema or viewport)

* chore: lockfile for html-to-image

* fix: raise schema visualizer toolbar above legend so export menu isn't hidden

* feat: schema export via save dialog, transparent background option, save notification

* fix: render nothing in tab bar when no tabs are open

* style: reduce tab bar height from 40px to 36px

* style: reduce tab bar height to 32px

* style: revert tab bar height to 36px

* feat: split tab bar with fixed +Query and Changes actions on the right

* style: blue play-icon Query button in tab bar

* refactor: remove sidebar New Query button (now in tab bar)

* style: conditional bottom padding in sidebar toolbar when nothing is below

* feat: distinguish table and query tabs with icons

* style: tab icons follow active/inactive state, muted colors

* feat: query tab toolbar (run/format/dialect badge) + bare transparent editor

* style: blue rounded Run Query button in query toolbar

* feat: smart platform-aware shortcut tooltip on Run Query (⌘+⏎ / Ctrl+Enter)

* style: show only the shortcut in the Run Query tooltip

* fix: Cmd+Enter keybinding stale closure; add run pulse to query toolbar; bundle monaco locally (offline)

* feat: show placeholder text in empty query editor

* feat: SQL autocomplete — keywords + table names from active schema

* feat: per-table column autocomplete on 'table.' + docs update

* feat: query-variant result toolbar — export/refresh/columns left, smart-unit execution time right

* fix: populate execution_time_ms on query results so the toolbar can show time taken

* fix: re-measure monaco fonts after async font load to stop cursor drift

* feat: resizable + collapsible query results panel

* refactor: move results caret onto the resize handle (centered), bottom caret when collapsed

* style: thin drag strip with caret on its own centered pill

* refactor: remove Queue button from table toolbar (Changes lives in tab bar)

* style: changes button becomes bordered rounded icon with count badge

* docs: mark tab-bar Changes queue button in AGENTS.md and README

AGENTS.md

@@ -203,11 +203,16 @@ cargo test               # Rust tests
 | Connection cards grid (by folder) | ✅ | Grouped display, single-click to open DB viewer |
 | Folders CRUD | ✅ | Nested folders, reparent on delete, breadcrumb nav |
 | Tags CRUD | ✅ | Colors, drag reorder, filter connections by tag |
-| DB type filter (Postgres/MySQL/SQLite/Redis) | ✅ | Toggle chips to filter connection grid |
-| Global search (Cmd+K) | ✅ | Connection URL detection auto-fills new-connection form |
+| Tag filter dropdown | ✅ | ActionRow Tags button → dropdown with checkboxes, active-count badge, Manage tags → Settings. **OR semantics** — a connection shows if it has ANY selected tag (not all) |
+| Folder tag matching | ✅ | When any filter is active, folder cards show only if the folder matches a selected tag OR contains matching connections (directly or in subfolders) |
+| DB type filter (Postgres/MySQL/SQLite/Redis) | ✅ | Dropdown with checkboxes + Clear all; folder cards hidden when their contents don't match the DB type |
+| Environment filter | ✅ | Select in Filters dropdown: All / Production / Staging / Development / None (unassigned); counts toward active badge |
+| Global search (Cmd+K) | ✅ | Connection URL detection auto-fills new-connection form; shows results from ALL folders as if at root (folder scope bypassed while searching); breadcrumb shows "Showing Search Results" with Clear button |
+| Connection name editing | ✅ | Name field in GeneralTab edit form |
 | Import/Export connections (JSON) | ✅ | Bulk import with validation, skipped-record reporting |
 | Bulk select + delete connections/folders | ✅ | Checkbox selection with confirmation dialog |
-| Drag-and-drop connections to folders | ❌ | Currently only via edit form |
+| Drag-and-drop connections to folders | ✅ | Optimistic update with atomic snapshot rollback (race-condition hardened) |
+| Inline tag creation | ✅ | "Create first tag" inline form (name + color) in SearchableTagPicker empty state |
 | Move-to-folder bulk action | ❌ | |
 | Favorites / Recent connections | ❌ | |
 | Connection status indicator on cards | ❌ | |
@@ -232,7 +237,7 @@ cargo test               # Rust tests
 | Row selection (checkboxes + select all) | ✅ | Bulk copy (JSON/CSV/SQL) and delete |
 | Export toolbar (JSON, CSV, SQL, Markdown) | ✅ | Client-side Blob download of visible rows |
 | Auto-refresh timer | ✅ | Configurable interval in settings |
-| Changes queue (INSERT, UPDATE, DELETE) | ✅ | Queue changes → Commit All; cancel individual changes |
+| Changes queue (INSERT, UPDATE, DELETE) | ✅ | Queue changes → Commit All; cancel individual changes. Tab bar shows a **Changes** icon button with a pending-count badge that toggles the bottom panel (the queue dropdown was removed from the table toolbar — one entry point only) |
 | Edit connection modal (from DB viewer) | ✅ | AnimatedModal with keychain password fetch on test |
 | Connection drop banner | ✅ | Auto-detects broken connections with reconnect prompt |
 | Inline cell editing | ❌ | Cells are read-only; changes via queue Insert button only |
@@ -258,11 +263,12 @@ cargo test               # Rust tests
 ### Query Editor
 | Feature | Status | Details |
 | :--- | :---: | :--- |
-| SQL text editor (Monaco) | ❌ | `src/components/editor/` does not exist yet |
-| SQL autocomplete (keywords, tables, columns) | ❌ | |
-| Custom query execution (arbitrary SQL) | ❌ | Only `SELECT * FROM table` via tab open |
+| SQL text editor (Monaco) | ✅ | Lazy-loaded Monaco SQL editor with Cmd/Ctrl+Enter to run (`src/components/editor/QueryEditor.tsx`) |
+| Custom query execution (arbitrary SQL) | ✅ | `execute_query` Rust command: subquery-wrapped pagination + raw fallback; PostgreSQL + SQLite; results in virtualized grid |
+| Destructive query guard | ✅ | Confirmation dialog for INSERT/UPDATE/DELETE/DROP/ALTER/TRUNCATE/CREATE/REPLACE (`isDestructiveQuery` + `DestructiveQueryDialog`) |
+| Query history / recent queries | 🟡 | Backend + commands done (v5 `query_history` table, `get_query_history`/`clear_query_history`); UI dropdown to show history in the query editor is **not wired yet** |
+| SQL autocomplete (keywords, tables, columns) | ✅ | Completion provider in `src/lib/monacoSetup.ts` backed by `src/lib/sqlCompletion.ts` (pure, unit-tested): keywords (~60) + table names from the active schema; typing `table.` or `schema.table.` suggests that table's columns (introspected via `get_schema_graph`, cached per schema in memory, `incomplete: true` warm-up on first use) |
 | Multiple result sets | ❌ | |
-| Query history / recent queries | ❌ | No persistence or UI |
 | Saved queries (named, organized) | ❌ | No `queries` table in local SQLite |
 | Query favorites / pinning | ❌ | |
 | Editor settings (font, tab size, word wrap, minimap) | ❌ | Settings page has "Editor" tab with "coming soon" placeholder |
@@ -303,6 +309,11 @@ cargo test               # Rust tests
 | Getting started / onboarding flow | ❌ | |
 | Welcome tooltips / tour | ❌ | |
 
+### AI Integration (Future Planning)
+| Feature | Status | Details |
+| :--- | :---: | :--- |
+| AI assistant (BYOK) | 🔮 | **Planned for future.** Bring-Your-Own-Key model (user supplies their own API key — no paywall, no bundling). Intended use cases: natural-language → SQL generation, query explanations, schema summaries, error message suggestions. No design decided yet — deliberate before implementation (privacy: SQL/text only sent to user's chosen provider, key stored in OS keychain like DB passwords). |
+
 ---
 
 ## Related Documents