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+# SQL (and API) schema changes
+
+Intend to make these changes at the same time as bumping OpenAPI schema from
+0.2 to 0.3, along with `20190510_editgroup_endpoint_prefix` and
+`20190510_release_ext_ids`.
+
+Also adding some indices to speed up entity edit history views, but those are
+just a performance change, not visible in API schema.
+
+### Structured Contrib Names
+
+`creator` entities already have "structured" names: in addition to
+`display_name`, there are `given_name` and `surname` fields. This change is to
+add these two fields to release contribs as well (to join `raw_name`).
+
+The two main motivations are:
+
+1. make various representations (eg, citation formats) of release entities
+   easier. CSL and many display formats require given/surname distinctions
+2. improve algorithmic matching between release entities, raw metadata (eg,
+   from GROBID), and citation strings. Eg, biblio-glutton wants "first author
+   surname"; we can't provide this from existing `raw_name` field
+
+The status quo is that many large metadata sources often include structured
+names, and we munge them into a single name.
+
+Some arguments against this change are:
+
+1. should be "normalizing" this structure into creator entities. However,
+   display/representation of a contributor might change between publications
+2. structure isn't always deterministic from what is visible in published
+   documents. AKA, raw name is unambiguous (it's what is "printed" on the
+   document), but given/sur decomposition can be ambiguous (for individauls, or
+   entire locales/cultures)
+3. could just stash in contrib `extra_json`. However, seems common enough to
+   include as full fields
+
+Questions/Decisions:
+
+- should contrib `raw_name` be changed to `display_name` for consistency with
+  `creator`? `raw_name` should probably always be what is in/on the document
+  itself, thus no.
+- should we still munge a `raw_name` at insert time (we we only have structured
+  names), or push this on to client code to always create something for
+  display?
+
+### Rename `release_status` to `release_stage`
+
+Describes the field better. I think this is uncontroversial and not too
+disruptive at this point.
+
+### New release fields: subtitle, number, version
+
+`subtitle`: mostly for books. could have a flat-out style guide policy against
+use for articles? Already frequently add subtitle metadata as an `extra_json`
+field.
+
+`number`: intended to represent, eg, a report number ("RFC ..."). Not to be
+confused with `container-number`, `chapter`, `edition`
+
+`version`: intended to be a short string ("v3", "2", "third", "3.9") to
+disambiguate which among multiple versions. CSL has a separate `edition` field.
+
+These are somewhat hard to justify as dedicated fields vs. `extra_json`.
+
+`subtitle` is a pretty core field for book metadata, but raises ambiguity for
+other release types.
+
+Excited to include many reports and memos (as grey lit), for which the number
+is a pretty major field, and we probably want to include in elasticsearch but
+not as part of the title field, and someday perhaps an index on `number`, so
+that's easier to justify.
+
+TODO:
+
+- `version` maybe should be dropped. arXiv is one possible justification, as is
+  sorting by this field in display.
+
+### Withdrawn fields
+
+As part of a plan to represent retractions and other "unpublishing", decided to
+track when and whether a release has been "withdrawn", distinct from the
+`release_stage`.
+
+To motivate this, consider a work that has been retracted. There are multiple
+releases of different stages; should not set the `release_stage` for all to
+`withdrawn` or `retracted`, because then hard to disambiguate between the
+release entities. Also maybe the pre-print hasn't been formally withdrawn and
+is still in the pre-print server, or maybe only the pre-print was withdrawn
+(for being partial/incorrect?) while the final version is still "active".
+
+As with `release_date`, just `withdrawn_date` is insufficient, so we get
+`withdrawn_year` also...  and `withdrawn_month` in the future? Also
+`withdrawn_state` for cases where we don't know even the year. This could
+probably be a bool (`is_withdrawn` or `withdrawn`), but the flexibility of a
+TEXT/ENUM has been nice.
+
+TODO:
+
+- boolean (`is_withdrawn`, default False) or text (`withdrawn_status`). Let's
+  keep text to allow evolution in the future; if the field is defined at all
+  it's "withdrawn" (true), if not it isn't
+
+### New release extids: `mag_id`, `ark_id`
+
+See also: `20190510_release_ext_ids`.
+
+- `mag_id`: Microsoft Academic Graph identifier.
+- `ark_id`: ARK identifier.
+
+These will likely be the last identifiers added as fields on `release`; a
+future two-stage refactor will be to move these out to a child table (something
+like `extid_type`, `extid_value`, with a UNIQ index for lookups).
+
+Perhaps the `extid` table should be implemented now, starting with these
+identifiers?
+
+### Web Capture CDX `size_bytes`
+
+Pretty straight-forward. 
+
+Considered adding `extra_json` as well, to be consistent with other tables, but
+feels too heavy for the CDX case. Can add later if there is an actual need;
+adding fields easier than removing (for backwards compat).
+
+### Object/Class Name Changes
+
+TODO
+
+### Rust/Python Library Name Changes
+
+Do these as separate commits, after merging back in to master, for v0.3:
+
+- rust `fatcat-api-spec` => `fatcat-openapi`
+- python `fatcat_client` => `fatcat_openapi_client`
+
+### More?
+
+`release_month`: apprently pretty common to know the year and month but not
+date. I have avoided so far, seems like unnecessary complexity. Could start
+as an `extra_json` field?