diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d87447d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/internals-*.db.lz
diff --git a/Makefile b/Makefile
index 08e9342..61a71bf 100644
--- a/Makefile
+++ b/Makefile
@@ -1,10 +1,177 @@
 MY_INTERNALS = $(HOME)/Library/Mobile\ Documents/com~apple~TextEdit/Documents/Apple\ Internals.rtf
+DB := $(if $(DB),$(DB:.lz=),internals-$(shell sw_vers -productVersion).db)
+DB_TARGETS = db_files db_binaries db_manifests db_assets db_services
+CHECK_TARGETS = check_files check_binaries check_manifests check_services
 
-.PHONY: all
+.PHONY: all check $(DB_TARGETS) $(CHECK_TARGETS)
+.INTERMEDIATE: $(DB)
 
-all: internals.txt
+all: $(DB).lz check
 
 ifneq ($(wildcard $(MY_INTERNALS)),)
 internals.txt: $(MY_INTERNALS)
 	textutil -cat txt "$<" -output $@
 endif
+
+ifneq ($(wildcard $(DB).lz),)
+$(DB): $(DB).lz
+	compression_tool -decode -i $< -o $@
+else
+$(DB):
+	@$(MAKE) --silent --jobs=1 $(DB_TARGETS) | sqlite3 -bail $@
+
+$(DB).lz: $(DB)
+	compression_tool -encode -i $< -o $@
+	tmutil addexclusion $@
+	rm -rf dyld
+endif
+
+check: internals.txt
+	@LANG=en sort --ignore-case $< | diff -uw $< -
+	@$(MAKE) --silent --jobs=1 $(CHECK_TARGETS)
+
+
+# MARK: - data extraction helpers
+
+NIX = $(shell nix-build --no-out-link -A nixFlakes '<nixpkgs>')/bin/nix
+ACEXTRACT = $(shell \
+	$(NIX) --experimental-features 'nix-command flakes' build --no-write-lock-file .\#acextract && \
+	readlink result && rm result)/bin/acextract
+DSCU = $(shell \
+	$(NIX) --experimental-features 'nix-command flakes' build --no-write-lock-file .\#dyld-shared-cache && \
+	readlink result && rm result)/bin/dyld_shared_cache_util
+
+dyld: /System/Library/dyld/dyld_shared_cache_$(shell uname -m)
+	$(DSCU) -extract $@ $<
+	find $@ -type f -print0 | xargs -0 chmod a+x
+
+prefix = $$(case $(1) in \
+	(macOS) ;; \
+	(macOS-dyld) echo $(dir $(realpath $(firstword $(MAKEFILE_LIST))))/dyld ;; \
+	(iOS) echo /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot ;; \
+	(tvOS) echo /Applications/Xcode.app/Contents/Developer/Platforms/AppleTVOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/tvOS.simruntime/Contents/Resources/RuntimeRoot ;; \
+	(watchOS) echo /Applications/Xcode.app/Contents/Developer/Platforms/WatchOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/watchOS.simruntime/Contents/Resources/RuntimeRoot ;; \
+	esac)
+
+find = \
+	{ \
+		$(2) find /Library /System /bin /dev /private /sbin /usr ! \( -path /System/Volumes/Data -prune \) $(1) 2> /dev/null | sed 's/^/macOS /' ; \
+		cd /Applications/Xcode.app/Contents/Developer ; find Library Toolchains Tools usr $(1) | sed 's|^|macOS /Applications/Xcode.app/Contents/Developer/|' ; \
+		test -d "$(call prefix,macOS-dyld)" && cd "$(call prefix,macOS-dyld)" && find . $(1) | sed '1d;s/^\./macOS-dyld /' ; \
+		cd $(call prefix,iOS) ; find . $(1) | sed '1d;s/^\./iOS /' ; \
+		cd $(call prefix,tvOS) ; find . $(1) | sed '1d;s/^\./tvOS /' ; \
+		cd $(call prefix,watchOS) ; find . $(1) | sed '1d;s/^\./watchOS /' ; \
+	}
+
+file = SELECT id, $(1) FROM files WHERE os = '$$os' AND path = '$$(echo "$$path" | sed "s/'/''/g")'
+, = , # for entering a literal comma as part of a function argument
+
+
+# MARK: - generator targets for database
+
+$(DB_TARGETS)::
+	echo 'BEGIN IMMEDIATE TRANSACTION;'
+
+db_files:: dyld
+	if ! csrutil status | grep -Fq disabled ; then \
+		printf '\033[1mdisable SIP to get complete file information\033[m\n' >&2 ; \
+		echo 'FAIL;' ; \
+		exit 1 ; \
+	fi
+	printf '\033[1mcollecting file information...\033[m\n' >&2
+	echo 'DROP TABLE IF EXISTS files;'
+	echo 'CREATE TABLE files (id INTEGER PRIMARY KEY, os TEXT, path TEXT, executable BOOLEAN);'
+	$(call find,,sudo) | sed -E "s/'/''/g;s/([^ ]*) (.*)/INSERT INTO files (os, path) VALUES('\1', '\2');/"
+	find $(HOME)/Library | sed "s|^$(HOME)|~|;s/'/''/g;s/.*/INSERT INTO files (os, path) VALUES('macOS', '&');/"
+	echo 'CREATE INDEX files_path ON files (path);'
+
+db_binaries:: dyld
+	printf '\033[1mcollecting executable information...\033[m\n' >&2
+	echo 'DROP TABLE IF EXISTS linkages;'
+	echo 'DROP TABLE IF EXISTS entitlements;'
+	echo 'DROP TABLE IF EXISTS strings;'
+	echo 'CREATE TABLE linkages (id INTEGER REFERENCES files, dylib TEXT);'
+	echo 'CREATE TABLE entitlements (id INTEGER REFERENCES files, plist JSON);'
+	echo 'CREATE TABLE strings (id INTEGER REFERENCES files, string TEXT);'
+	$(call find,-follow -type f -perm +111) | while read -r os path ; do \
+		echo "UPDATE files SET executable = true WHERE os = '$$os' AND path = '$$path';" ; \
+		if test -r "$(call prefix,$$os)$$path" && file --no-dereference --brief --mime-type "$(call prefix,$$os)$$path" | grep -Fq application/x-mach-binary ; then \
+			objdump --macho --dylibs-used "$(call prefix,$$os)$$path" | \
+				sed "1d;s/^.//;s/ ([^)]*)$$//;s/'/''/g;s|.*|INSERT INTO linkages $(call file,'&');|" ; \
+			codesign --display --entitlements - "$(call prefix,$$os)$$path" 2> /dev/null | \
+				sed 1d | plutil -convert json - -o - | \
+				sed "/^<stdin>: Property List error/d;/^{}/d;s/'/''/g;s|.*|INSERT INTO entitlements $(call file,json('&'));\n|" ; \
+			strings -n 8 "$(call prefix,$$os)$$path" | \
+				LANG=C sed "s/'/''/g;s|.*|INSERT INTO strings $(call file,'&');|" ; \
+		fi ; \
+	done
+
+db_manifests::
+	printf '\033[1mcollecting Info.plist information...\033[m\n' >&2
+	echo 'DROP TABLE IF EXISTS info;'
+	echo 'CREATE TABLE info (id INTEGER REFERENCES files, plist JSON);'
+	$(call find,-type f -name 'Info.plist') | while read -r os path ; do \
+		test -r "$(call prefix,$$os)$$path" && plutil -convert json "$(call prefix,$$os)$$path" -o - | \
+			sed "/: invalid object/d;s/'/''/g;s|.*|INSERT INTO info $(call file,json('&'));\n|" ; \
+	done
+
+db_assets::
+	printf '\033[1mcollecting asset catalog information...\033[m\n' >&2
+	echo 'DROP TABLE IF EXISTS assets;'
+	echo 'CREATE TABLE assets (id INTEGER REFERENCES files, name TEXT);'
+	$(call find,-type f -name '*.car') | while read -r os path ; do \
+		test -r "$(call prefix,$$os)$$path" && $(ACEXTRACT) --list --input "$(call prefix,$$os)$$path" | \
+			sed "1d;s/'/''/g;s|.*|INSERT INTO assets $(call file,'&');|" ; \
+	done
+
+db_services::
+	printf '\033[1mcollecting launchd service information...\033[m\n' >&2
+	echo 'DROP TABLE IF EXISTS services;'
+	echo 'CREATE TABLE services (id INTEGER REFERENCES files, kind TEXT, plist JSON);'
+	$(call find,-type f -name '*.plist' -path '*/LaunchAgents/*' -o -path '*/LaunchDaemons/*') | while read -r os path ; do \
+		case "$$path" in (*/LaunchAgents/*) kind=agent ;; (*/LaunchDaemons/*) kind=daemon ;; esac ; \
+		test -r "$(call prefix,$$os)$$path" && plutil -convert json "$(call prefix,$$os)$$path" -o - | \
+			sed "s/'/''/g;s|.*|INSERT INTO services $(call file,'$$kind'$(,)json('&'));\n|" ; \
+	done
+
+$(DB_TARGETS)::
+	echo 'COMMIT TRANSACTION;'
+
+
+# MARK: - check targets for internals.txt
+
+check_files: internals.txt $(DB)
+	printf '\033[1mchecking files...\033[m\n' >&2
+	grep -ow '~\?/[^,;]*' $< | sed -E 's/ \(.*\)$$//;s/^\/(etc|var)\//\/private&/' | \
+		sed "s/'/''/g;s|.*|SELECT count(*), '&' FROM files WHERE path GLOB '&';|" | \
+		sqlite3 $(DB) | sed -n "/^0|/{s/^0|//;p;}"
+
+check_binaries: internals.txt $(DB)
+	printf '\033[1mchecking command line tools...\033[m\n' >&2
+	grep -o 'command line tools\?: [^;]*' $< | sed 's/^[^:]*: //;s/ //g;s/([^)]*)//g' | tr , '\n' | \
+		sed "s/'/''/g;s|.*|SELECT count(*), '&' FROM files WHERE executable = true AND path GLOB '*/&';|" | \
+		sqlite3 $(DB) | sed -n "/^0|/{s/^0|//;p;}"
+	printf '\033[1mchecking frameworks...\033[m\n' >&2
+	grep -ow '[[:alnum:]]*\.framework[[:alnum:]/.]*' $< | \
+		sed "s|/|/*/|g;s/'/''/g;s|.*|SELECT count(*), '&' FROM files WHERE executable = true AND path GLOB '*/&/*';|" | \
+		sqlite3 $(DB) | sed -n "/^0|/{s/^0|//;p;}"
+	printf '\033[1mchecking servers...\033[m\n' >&2
+	grep -o 'servers\?: [^;]*' $< | sed 's/^[^:]*: //;s/ //g;s/([^)]*)//g' | tr , '\n' | \
+		sed "s/'/''/g;s/.*/SELECT count(*), '&' FROM strings WHERE string GLOB '*&*';/" | \
+		sqlite3 $(DB) | sed -n "/^0|/{s/^0|//;p;}"
+
+check_manifests: internals.txt $(DB)
+	printf '\033[1mchecking extension points...\033[m\n' >&2
+	grep -o 'extension points\?: [^;]*' $< | sed 's/^[^:]*: //;s/ //g;s/([^)]*)//g' | tr , '\n' | \
+		sed "s/'/''/g;s|.*|SELECT count(*), '&' FROM info, json_each(plist, '$$.NSExtension') WHERE key = 'NSExtensionPointIdentifier' AND value = '&';|" | \
+		sqlite3 $(DB) | sed -n "/^0|/{s/^0|//;p;}"
+
+check_services: internals.txt $(DB)
+	printf '\033[1mchecking launchd services...\033[m\n' >&2
+	grep -o 'launchd services\?: [^;]*' $< | sed 's/^[^:]*: //;s/ //g;s/([^)]*)//g' | tr , '\n' | \
+		sed "s/'/''/g;s|.*|SELECT count(*), '&' FROM services, json_each(plist) WHERE key = 'Label' AND value = '&';|" | \
+		sqlite3 $(DB) | sed -n "/^0|/{s/^0|//;p;}"
+	printf '\033[1mchecking special ports...\033[m\n' >&2
+	grep -o '[^ ]* special port [0-9]*' $< | \
+		sed -E "s/'/''/g;s/(host|task) special port ([0-9]+)/SELECT count(*), '&' FROM services, json_tree(plist, '$$.MachServices') WHERE key LIKE '\1SpecialPort' AND value = \2;/" | \
+		sqlite3 $(DB) | sed -n "/^0|/{s/^0|//;p;}"