basic file sharing

backend/migrations/20250810215614_create_shares_table.sql

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+CREATE TABLE shares (
+	id UUID PRIMARY KEY DEFAULT GEN_RANDOM_UUID(),
+	creator_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+	warren_id UUID NOT NULL REFERENCES warrens(id) ON DELETE CASCADE,
+	path VARCHAR NOT NULL,
+	password_hash VARCHAR NOT NULL,
+	expires_at TIMESTAMP,
+	created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+);

backend/migrations/20250825115342_share_permissions.sql

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+ALTER TABLE
+	user_warrens
+ADD COLUMN 
+	can_list_shares BOOLEAN NOT NULL DEFAULT false,
+ADD COLUMN 
+	can_create_shares BOOLEAN NOT NULL DEFAULT false,
+ADD COLUMN 
+	can_modify_shares BOOLEAN NOT NULL DEFAULT false,
+ADD COLUMN 
+	can_delete_shares BOOLEAN NOT NULL DEFAULT false;
+
+ALTER TABLE
+	user_warrens
+ALTER COLUMN
+	can_list_shares DROP DEFAULT,
+ALTER COLUMN
+	can_create_shares DROP DEFAULT,
+ALTER COLUMN
+	can_modify_shares DROP DEFAULT,
+ALTER COLUMN
+	can_delete_shares DROP DEFAULT;

backend/migrations/20250825143434_shares_password_nullable.sql

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+ALTER TABLE shares ALTER COLUMN password_hash DROP NOT NULL;

backend/migrations/20250825150026_shares_path_index.sql

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+CREATE INDEX idx_shares_path ON shares(path);