IMQS docstore 3rd try

notes.txt

3	Initialize Go project
8	DB design (DocMeta, DocBlob, Share, Link)

Migration
16	Use native Go/Mongo driver - SELECT ALL on everything except Blob
8	Test migrations on infraqa, imqsrc, demo

While migration is taking place, service must respond to ping.
Use regular migration system to ensure correctness.

APIs

2	GET Document Blob + tests (Fetch by ID)
1	PUT Document + tests
2	DELETE Document + tests
1	GET Document Hash + tests
2	GET Metadata + tests
1	FIND Documents, from DB, Table, Field (longlived ID search)

Share
2	CREATE Share + tests
1	GET + tests
1	DELETE + tests

DB Design
---------

Docs
	id (bigserial)
	blob (sha256)
	path (varchar, slash separated for hierarchical tree: Water/Planbooks/abcd.pdf)
	created_by
	created_at
	modified_by
	modified_at
	deleted_at
	isalive (boolean default true)
	contentType
	blobSize
index (isalive, blob)
index (isalive, path)
FTS   path WHERE isalive

Links
	docid (int64) -- Docs.id
	geometry
	db (varchar)
	table (varchar)
	field (varchar)
	value (varchar)  -- field+value = longlived ID
	[value can become outdated, and be healed via geometry]
	legacyLat (double)
	legacyLon (double)
	
Blob (in Postgres, but also hidden behind BlobStore interface)
	(key:sha256 -> value:bytea)

Share
	token (varchar)
	docid (int64)
	expires_at.. etc..