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CREATE TABLE IF NOT EXISTS image(
sha1 TEXT NOT NULL, -- SHA-1 hash of file in lowercase hexadecimal
width INTEGER NOT NULL, -- cached media width
height INTEGER NOT NULL, -- cached media height
thumbw INTEGER, -- cached thumbnail width, if known
thumbh INTEGER, -- cached thumbnail height, if known
dhash INTEGER, -- uint64 perceptual hash as a signed integer
CHECK (unhex(sha1) IS NOT NULL AND lower(sha1) = sha1),
PRIMARY KEY (sha1)
) STRICT;
CREATE INDEX IF NOT EXISTS image__dhash ON image(dhash);
--
CREATE TABLE IF NOT EXISTS node(
id INTEGER NOT NULL, -- unique ID
parent INTEGER REFERENCES node(id), -- root if NULL
name TEXT NOT NULL, -- path component
mtime INTEGER, -- files: Unix time in seconds
sha1 TEXT REFERENCES image(sha1), -- files: content hash
PRIMARY KEY (id)
) STRICT;
CREATE INDEX IF NOT EXISTS node__sha1 ON node(sha1);
CREATE UNIQUE INDEX IF NOT EXISTS node__parent_name
ON node(IFNULL(parent, 0), name);
CREATE TRIGGER IF NOT EXISTS node__sha1__check
BEFORE UPDATE OF sha1 ON node
WHEN OLD.sha1 IS NULL AND NEW.sha1 IS NOT NULL
AND EXISTS(SELECT id FROM node WHERE parent = OLD.id)
BEGIN
SELECT RAISE(ABORT, 'trying to turn a non-empty directory into a file');
END;
/*
Automatic garbage collection, not sure if it actually makes any sense.
It's also not recursive, but it should be:
CREATE TRIGGER IF NOT EXISTS node__parent__gc
AFTER DELETE ON node FOR EACH ROW
BEGIN
DELETE FROM node WHERE id = OLD.parent
AND id NOT IN (SELECT DISTINCT parent FROM node);
END;
*/
--
CREATE TABLE IF NOT EXISTS orphan(
sha1 TEXT NOT NULL REFERENCES image(sha1),
path TEXT NOT NULL, -- last occurence within the database hierarchy
PRIMARY KEY (sha1)
) STRICT;
-- Renaming/moving a file can result either in a (ref, unref) or a (unref, ref)
-- sequence during sync, and I want to get at the same result.
CREATE TRIGGER IF NOT EXISTS node__sha1__deorphan_insert
AFTER INSERT ON node
WHEN NEW.sha1 IS NOT NULL
BEGIN
DELETE FROM orphan WHERE sha1 = NEW.sha1;
END;
CREATE TRIGGER IF NOT EXISTS node__sha1__deorphan_update
AFTER UPDATE OF sha1 ON node
WHEN NEW.sha1 IS NOT NULL
BEGIN
DELETE FROM orphan WHERE sha1 = NEW.sha1;
END;
--
CREATE TABLE IF NOT EXISTS tag_space(
id INTEGER NOT NULL,
name TEXT NOT NULL,
description TEXT,
CHECK (name NOT LIKE '%:%'),
PRIMARY KEY (id)
) STRICT;
CREATE UNIQUE INDEX IF NOT EXISTS tag_space__name ON tag_space(name);
-- To avoid having to deal with NULLs, always create this special tag space.
INSERT OR IGNORE INTO tag_space(id, name, description)
VALUES(0, '', 'User-defined tags');
CREATE TABLE IF NOT EXISTS tag(
id INTEGER NOT NULL,
space INTEGER NOT NULL REFERENCES tag_space(id),
name TEXT NOT NULL,
PRIMARY KEY (id)
) STRICT;
CREATE UNIQUE INDEX IF NOT EXISTS tag__space_name ON tag(space, name);
CREATE TABLE IF NOT EXISTS tag_assignment(
sha1 TEXT NOT NULL REFERENCES image(sha1),
tag INTEGER NOT NULL REFERENCES tag(id),
weight REAL NOT NULL, -- 0..1 normalized weight assigned to tag
PRIMARY KEY (sha1, tag)
) STRICT;
CREATE INDEX IF NOT EXISTS tag_assignment__tag ON tag_assignment(tag);
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