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+Idea grab bag
+-------------
+
+- track devices:
+    - alert when never before seen device is plugged-in
+    - report history and trends on when and how-often each
+      device/category is plugged-in, how-long it stays plaugged-in, etc.
+- daemonize `khatus`, so we don't have to re-launch `X11` to re-launch `khatus`
+- interoperate with other khatus nodes
+    - prefix machine ID to each data source
+      (What should that ID be? Hostname? Pub key?)
+    - fetch remote data and process locally
+    - what transport to use?
+        - ssh + rsync + cache dumps per some interval?
+    - `A` can setup self penetration testing, by setting up probe of `A` on `B`
+      and fetching results from `B` to `A`
+- offline mode - quick disable all network-using subsystems (sensors, monitors, etc)
+- classify each sensor as either "local" or "remote" (what about `iwconfig`, et al?)
+- store data with rrdtool
+- some kind of personal calendar thing integration
+- monitor tracking numbers (17track should be easiest to get started with)
+- monitor password digests against known leaked password databases
+- monitor stock prices
+- monitor some item price(s) at some store(s) (Amazon, etc.)
+    - https://docs.aws.amazon.com/AWSECommerceService/latest/DG/EX_RetrievingPriceInformation.html
+    - https://docs.aws.amazon.com/AWSECommerceService/latest/DG/ReturningPrices.html
+    - https://developer.amazonservices.com/
+- monitor Amazon order status
+    - https://developer.amazonservices.com/gp/mws/api.html?group=orders&section=orders
+- monitor eBay order status
+    - http://developer.ebay.com/DevZone/XML/docs/Reference/eBay/GetOrders.html
+- monitor eBay auctions (https://en.wikipedia.org/wiki/EBay_API)
+- monitor PayPal (https://www.programmableweb.com/api/paypal)
+- monitor bank account balance and transactions
+    - https://communities.usaa.com/t5/Banking/Banking-via-API-Root/m-p/180789/highlight/true#M50758
+    - https://plaid.com/
+    - https://plaid.com/docs/api/
+    - https://plaid.com/docs/api/#institution-overview
+    - https://github.com/plaid
+    - https://www.bignerdranch.com/blog/online-banking-apis/
+- monitor/log road/traffic conditions
+    - travel times for some route over a course of time
+    - https://msdn.microsoft.com/en-us/library/hh441725
+    - https://cloud.google.com/maps-platform/
+    - https://cloud.google.com/maps-platform/routes/
+    - https://developer.mapquest.com/documentation/traffic-api/
+    - https://developer.here.com/api-explorer/rest/traffic/traffic-flow-bounding-box
+- monitor news sources for patterns/substrings
+    - http://developer.nytimes.com/
+    - https://news.ycombinator.com/
+    - https://lobste.rs/
+    - https://www.undeadly.org/
+    - http://openbsdnow.org/
+    - https://lwn.net/
+- monitor a git repository
+    - General
+        - total branches
+        - age of last change per branch
+        - change set sizes
+    - GitHub
+        - pull requests
+        - issues
+- monitor CI
+    - Travis
+    - Jenkins
+- pull/push data from/to other monitoring systems (Nagios, Graphite, etc.)
+- monitor file/directory age (can be used for email and other messaging systems)
+- monitor mailboxes for particular patterns/substrings
+- monitor IRC server(s)/channel(s) for particular patterns/substrings (use `ii`)
+- monitor iptables log
+    - auto-(un)block upon some threshold of violations
+- monitor changes in an arbitrary web resource
+    - deletions
+    - insertions
+    - delta = insertions - deletions
+- monitor/log LAN/WAN configurations (address, router, subnet)
+- monitor/log geolocation based on WAN IP address
+- correlate iptables violations with network/geolocation
+- monitor vulnerability databases
+    - https://nvd.nist.gov/
+    - https://vuldb.com/
+    - http://cve.mitre.org/
+- vacation planning optimization
+    - I want to visit a set of places within some time period. Given the
+      current set of prices, a set of constraints (I need to stay some amount
+      of days at each, I must be in X at Y date, etc), which visiting dates for
+      each are cheapest?
+- browse https://www.programmableweb.com/ for some more ideas
+- GC trick: instead of actually doing GC, do a dummy run of building a status
+  bar at `BEGIN`, to fill-in the atimes for keys we need, then use the atimes
+  keys to build a regular expression to accept messages only from keys we
+  actually use
+
+Many of the above will undoubtedly need non-standard-system dependencies
+(languages, libraries, etc.), in which case - would they be better off as
+separate projects/repos?
+
+With all these ideas, it is starting to sound very noisy, but no worries - to
+quickly and temporarily shut everything up - just kill `dunst` and or toggle
+the status bar (`Alt` + `B` in `dwm`). For a permanent change - just don't
+turn-on the unwanted monitors/sensors.