Add selective index updates (n/m) to the heap table AM

.clangd

@@ -0,0 +1,43 @@
+Diagnostics:
+  MissingIncludes: None
+InlayHints:
+  Enabled: true
+  ParameterNames: true
+  DeducedTypes: true
+CompileFlags:
+  CompilationDatabase: build/       # Search build/ directory for compile_commands.json
+  Remove: [ -Werror ]
+  Add:
+  - -DDEBUG
+  - -DLOCAL
+  - -DPGDLLIMPORT=
+  - -DPIC
+  - -O2
+  - -Wall
+  - -Wcast-function-type
+  - -Wconversion
+  - -Wdeclaration-after-statement
+  - -Wendif-labels
+  - -Werror=vla
+  - -Wextra
+  - -Wfloat-equal
+  - -Wformat-security
+  - -Wimplicit-fallthrough=3
+  - -Wmissing-format-attribute
+  - -Wmissing-prototypes
+  - -Wno-format-truncation
+  - -Wno-sign-conversion
+  - -Wno-stringop-truncation
+  - -Wno-unused-const-variable
+  - -Wpointer-arith
+  - -Wshadow
+  - -Wshadow=compatible-local
+  - -fPIC
+  - -fexcess-precision=standard
+  - -fno-strict-aliasing
+  - -fvisibility=hidden
+  - -fwrapv
+  - -g
+  - -std=c11
+  - -I.
+  - -I../../../../src/include

.envrc

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+watch_file flake.nix
+use flake

.gdbinit

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+# tepid dev additions: .gdbinit for debugging the HOT-indexed updates branch
+#
+# Usage:
+#   gdb -x .gdbinit <postgres-binary>
+#   source .gdbinit            (from inside gdb)
+#
+# This file is tracked in the repo for developer convenience on the tepid
+# branch.  It is not intended for upstream consumption and is ignored when
+# generating patches for the mailing list.
+#
+# What this file does:
+#   - Sources src/tools/gdb/tepid-helpers.py, which registers three
+#     commands: tepid-break, tepid-page, tepid-index.
+#   - Calls tepid-break immediately to install pending breakpoints in
+#     every function the branch adds or materially changes.  Breakpoints
+#     are pending so the command is safe to run before symbols load (e.g.
+#     before attach).
+#
+# Breakpoints fall into four functional groups:
+#   Write path:    heap_build_hot_indexed_tombstone,
+#                  heap_hot_indexed_tombstone_attr_modified,
+#                  HeapUpdateHotAllowable, heap_update
+#   WAL:           heap_xlog_update
+#   Read path:     heap_hot_search_buffer, _bt_heap_keys_equal_leaf,
+#                  ExecSetIndexUnchanged, RelationGetIndexedAttrs,
+#                  _bt_check_unique
+#   Prune:         prune_handle_tombstones
+#   Stats:         pg_relation_hot_indexed_stats
+#
+# To disable a specific breakpoint group temporarily use gdb's own
+# "disable" / "enable" commands with the breakpoint numbers shown by
+# "info breakpoints" after tepid-break runs.
+
+# Keep a local repo-rooted path in sync with the worktree.
+source src/tools/gdb/tepid-helpers.py
+
+# Install the breakpoints.  Pending mode keeps them queued until the
+# postgres binary has loaded symbols.
+set breakpoint pending on
+tepid-break
+
+# Convenience: print (col=val, ...) tuples, one per line.
+set print pretty on
+set print array on
+set print union on
+
+# Useful aliases that don't have command-class entries in tepid-helpers.
+define tbreak
+    tepid-break
+end
+document tbreak
+    Alias for tepid-break.  Installs pending breakpoints for every
+    function the tepid branch adds or materially changes.
+end
+
+define tpage
+    tepid-page $arg0 $arg1
+end
+document tpage
+    tpage RELNAME BLKNUM -- show HOT chains on a heap page.  Wraps
+    tepid-page; identical argument syntax.
+end
+
+define tindex
+    tepid-index $arg0 $arg1
+end
+document tindex
+    tindex IDXNAME BLKNUM -- show btree leaf entries.  Wraps
+    tepid-index; identical argument syntax.
+end

.github/.gitignore

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+# Node modules
+scripts/ai-review/node_modules/
+# Note: package-lock.json should be committed for reproducible CI/CD builds
+
+# Logs
+scripts/ai-review/cost-log-*.json
+scripts/ai-review/*.log
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Editor files
+*.swp
+*.swo
+*~
+.vscode/
+.idea/

.github/DEV_SETUP_FIX.md

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+# Dev Setup Commit Fix - Summary
+
+**Date:** 2026-03-10
+**Issue:** Sync workflow was failing because "dev setup" commits were detected as pristine master violations
+
+## Problem
+
+The sync workflow was rejecting the "dev setup v19" commit (e5aa2da496c) because it modifies files outside `.github/`. The original logic only allowed `.github/`-only commits, but didn't account for personal development environment commits.
+
+## Solution
+
+Updated sync workflows to recognize commits with messages starting with "dev setup" (case-insensitive) as allowed on master, in addition to `.github/`-only commits.
+
+## Changes Made
+
+### 1. Updated Sync Workflows
+
+**Files modified:**
+- `.github/workflows/sync-upstream.yml` (automatic hourly sync)
+- `.github/workflows/sync-upstream-manual.yml` (manual sync)
+
+**New logic:**
+```bash
+# Check for "dev setup" commits
+DEV_SETUP_COMMITS=$(git log --format=%s upstream/master..origin/master | grep -i "^dev setup" | wc -l)
+
+# Allow merge if:
+# - Only .github/ changes, OR
+# - Has "dev setup" commits
+if [ "$COMMITS_AHEAD" -gt 0 ] && [ "$NON_GITHUB_CHANGES" -gt 0 ]; then
+  if [ "$DEV_SETUP_COMMITS" -eq 0 ]; then
+    # FAIL: Code changes outside .github/ that aren't dev setup
+    exit 1
+  else
+    # OK: Dev setup commits are allowed
+    continue merge
+  fi
+fi
+```
+
+### 2. Created Policy Documentation
+
+**New file:** `.github/docs/pristine-master-policy.md`
+
+Documents the "mostly pristine" master policy:
+- ✅ `.github/` commits allowed (CI/CD configuration)
+- ✅ "dev setup ..." commits allowed (personal development environment)
+- ❌ Code changes not allowed (must use feature branches)
+
+## Current Commit Order
+
+```
+master:
+1. 9a2b895daa0 - Complete Phase 3: Windows builds + fix sync (newest)
+2. 1e6379300f8 - Add CI/CD automation: hourly sync, Bedrock AI review
+3. e5aa2da496c - dev setup v19
+4. 03facc1211b - upstream commits... (oldest)
+```
+
+**All three local commits will now be preserved during sync:**
+- Commit 1: Modifies `.github/` ✅
+- Commit 2: Modifies `.github/` ✅
+- Commit 3: Named "dev setup v19" ✅
+
+## Testing
+
+After committing these changes, the next hourly sync should:
+1. Detect 3 commits ahead of upstream (including the fix commit)
+2. Recognize that they're all allowed (`.github/` or "dev setup")
+3. Successfully merge upstream changes
+4. Create merge commit preserving all local commits
+
+**Verify manually:**
+```bash
+# Trigger manual sync
+# Actions → "Sync from Upstream (Manual)" → Run workflow
+
+# Check logs for:
+# "✓ Found 1 'dev setup' commit(s) - will merge"
+# "✓ Successfully merged upstream with local configuration"
+```
+
+## Future Updates
+
+When updating your development environment:
+
+```bash
+# Make changes
+git add .clangd flake.nix .vscode/ .idea/
+
+# IMPORTANT: Start commit message with "dev setup"
+git commit -m "dev setup v20: Update IDE and LSP configuration"
+
+git push origin master
+```
+
+The sync will recognize this and preserve it during merges.
+
+**Naming patterns recognized:**
+- `dev setup v20` ✅
+- `Dev setup: Update tools` ✅
+- `DEV SETUP - New config` ✅
+- `development environment changes` ❌ (doesn't start with "dev setup")
+
+## Benefits
+
+1. **No manual sync resolution needed** for dev environment updates
+2. **Simpler workflow** - dev setup stays on master where it's convenient
+3. **Clear policy** - documented what's allowed vs what requires feature branches
+4. **Automatic detection** - sync workflow handles it all automatically
+
+## What to Commit
+
+```bash
+git add .github/workflows/sync-upstream.yml
+git add .github/workflows/sync-upstream-manual.yml
+git add .github/docs/pristine-master-policy.md
+git add .github/DEV_SETUP_FIX.md
+
+git commit -m "Fix sync to allow 'dev setup' commits on master
+
+The sync workflow was failing because the 'dev setup v19' commit
+modifies files outside .github/. Updated workflows to recognize
+commits with messages starting with 'dev setup' as allowed on master.
+
+Changes:
+- Detect 'dev setup' commits by message pattern
+- Allow merge if commits are .github/ OR dev setup
+- Update merge messages to reflect preserved changes
+- Document pristine master policy
+
+This allows personal development environment commits (IDE configs,
+debugging tools, shell aliases, etc.) on master without violating
+the pristine mirror policy.
+
+See .github/docs/pristine-master-policy.md for details"
+
+git push origin master
+```
+
+## Next Sync Expected Behavior
+
+```
+Before:
+  Upstream: A---B---C---D (latest upstream)
+  Master:   A---B---C---X---Y---Z (X=CI/CD, Y=CI/CD, Z=dev setup)
+
+  Status: 3 commits ahead, 1 commit behind
+
+After:
+  Master:   A---B---C---X---Y---Z---M
+                        \         /
+                         D-------/
+
+  Where M = Merge commit preserving all local changes
+```
+
+All three local commits (CI/CD + dev setup) preserved! ✅
+
+---
+
+**Status:** Ready to commit and test
+**Documentation:** See `.github/docs/pristine-master-policy.md`