Add Firestore backend#70
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Firestore (Native mode) implementation of eventstore.Store and Counter. Because Firestore allows only one disjunctive (in / array-contains-any) clause and one range field per query, QueryEvents pushes down the created_at range plus the single most selective dimension (ids > tag > authors > kinds) and enforces the rest client-side with filter.Matches, so results are always correct while reads stay bounded. CountEvents uses native aggregation when the filter is fully pushable, else counts matches. Indexable single-letter tags are flattened into a tagvalues array; content/sig/raw-tags are index-exempt to keep index storage down. Composite indexes and exemptions are in firestore.indexes.json.
Add a DatabaseID field and use NewClientWithDatabase so a backend can target a named Firestore database; defaults to "(default)". Point the integration test at the "nostr-events" collection.
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Adds a Firestore (Native mode) backend implementing eventstore.Store and eventstore.Counter, in the same shape as the DynamoDB backend. Since Firestore allows only one disjunctive (in / array-contains-any) clause and one range field per query, QueryEvents pushes down the created_at range plus the single most selective dimension (ids, one tag, authors, or kinds) and enforces the rest client-side with filter.Matches, so results stay correct while reads stay bounded. CountEvents uses native aggregation when the filter is fully pushable and otherwise counts matches. Single-letter tags are flattened into a tagvalues array; content/sig/raw tags are index-exempt to keep index storage down. Required composite indexes are in firestore/firestore.indexes.json, and DatabaseID selects a named database. Includes unit tests plus a build-tagged integration test verified against a live Firestore project.