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* feat(analytics): add PostHog client with async batch shipping Introduces server/internal/analytics, the shipping layer for the product funnel defined in docs/analytics.md. Capture is non-blocking — events are enqueued into a bounded channel and a background worker batches them to PostHog's /batch/ endpoint. A broken backend drops events rather than blocking request handlers. Local dev and self-hosted instances run a noop client until the operator sets POSTHOG_API_KEY. This is PR 1 of MUL-1122; signup and workspace_created emission land in the follow-up commit so this change is independently reviewable. * feat(server): emit signup and workspace_created analytics events Wires analytics.Client through handler.New and main, then emits the first two funnel events: - signup fires from findOrCreateUser (which now reports isNew), covering both the verification-code and Google OAuth entry points — a single emission site guarantees Google signups aren't missed. - workspace_created fires after the CreateWorkspace transaction commits, with is_first_workspace computed from a post-commit ListWorkspaces count so we can distinguish fresh-user activation from returning-user expansion. Tests use analytics.NoopClient so nothing ships from test runs. PR 1 of MUL-1122; runtime_registered and issue_executed follow in later PRs per the plan. * refactor(analytics): drop is_first_workspace from workspace_created Stamping "is this the user's first workspace?" at emit time races under concurrent CreateWorkspace requests: two transactions committing close together can both read a post-commit count greater than one and both emit false. Fixing it at the SQL layer requires a schema change we don't want in PR 1. PostHog answers the same question exactly from the event stream (funnel on "first time user does X" / cohort on $initial_event), so removing the property loses no information and makes the emit side race-free. * docs(analytics): document self-host safety defaults Spell out why self-hosted instances never ship events upstream by default (empty POSTHOG_API_KEY → noop client) and explain how operators can point at their own PostHog project without any code change. * feat(analytics): emit runtime_registered, issue_executed, team_invite_* Three server-side funnel events, all gated on first-time state transitions so retries and re-runs don't inflate the WAW buckets: - runtime_registered fires from DaemonRegister when UpsertAgentRuntime reports (xmax = 0) — i.e. the row was inserted, not updated. Heartbeats and re-registrations stay silent. - issue_executed fires from CompleteTask after an atomic UPDATE issue SET first_executed_at = now() WHERE id = $1 AND first_executed_at IS NULL flips the column for the first time. Retries, re-assignments, and comment-triggered follow-up tasks hit the WHERE clause and no-op. Carries nth_issue_for_workspace so the ≥1/≥2/≥5/≥10 buckets filter without extra queries. - team_invite_sent fires from CreateInvitation and team_invite_accepted from AcceptInvitation, closing the expansion funnel. Adds a 050 migration for issue.first_executed_at plus a partial index so the workspace-scoped executed-count query doesn't scan the never-executed tail. * feat(config): surface PostHog key via /api/config Extends AppConfig with posthog_key / posthog_host sourced from env on every request (so operators can rotate the key via secret refresh without a restart). Reading the key off the server — rather than baking it into the frontend bundle via NEXT_PUBLIC_* — means self-hosted instances inherit the blank key automatically and never ship events upstream. * feat(analytics): wire posthog-js identify + UTM capture on the client Adds @multica/core/analytics — a thin wrapper around posthog-js that owns attribution capture and identity merge. Posthog-js config comes from /api/config (not NEXT_PUBLIC_*), so self-hosted instances whose server returns an empty key automatically run the SDK inert. captureSignupSource stamps a multica_signup_source cookie with UTM params and the referrer's origin (never the full referrer — that can leak OAuth code/state in the callback URL). The backend signup event reads this cookie on new-user creation. Identity flows: - auth-initializer fires identify() right after getMe() resolves, on both cookie and token paths. A getConfig/getMe race is handled by buffering a pending identify inside the analytics module and flushing it once initAnalytics finishes. - auth store calls identify() on verifyCode / loginWithGoogle / loginWithToken and resetAnalytics() on logout so the next login merges cleanly without bleeding events. * docs(analytics): describe runtime_registered, issue_executed, invite events Fills in the schema for the remaining funnel events. Captures the design commentary that belongs next to the contract rather than in a PR description — in particular why issue_executed uses the atomic first_executed_at flip instead of counting task-terminal events, and why runtime_registered relies on xmax = 0 rather than a query-then-write. * fix(analytics): drop non-atomic nth_issue_for_workspace from issue_executed Computing the workspace's Nth-issue ordinal at emit time is not atomic under concurrent first-completions — two transactions can both run MarkIssueFirstExecuted, then both run CountExecutedIssuesInWorkspace, and both observe count=1 before either has committed, so both events go out stamped as n=1. Serialising it would mean a per-workspace advisory lock or a SERIALIZABLE-isolated tx; PostHog answers the same question exactly at query time via row_number() partitioned by workspace_id, so the emit-time property adds risk without adding information. Removes the property from analytics.IssueExecuted, deletes the unused CountExecutedIssuesInWorkspace query, and regenerates sqlc. The partial index stays — any future workspace-scoped executed-issue query will want it. * fix(analytics): wire $pageview and harden signup_source cookie payload Two frontend fixes from the PR review: - PageviewTracker, mounted under WebProviders, fires capturePageview on every Next.js App Router path / query-string change. Without this the capturePageview helper in @multica/core/analytics was never called and the acquisition funnel's / → signup step was empty. - captureSignupSource now caps each UTM / referrer value at 96 chars *before* JSON.stringify, and drops the whole cookie when the serialised payload still exceeds 512 chars. Previously the overall slice(0, 256) could leave a half-JSON string on the wire that neither the backend nor PostHog could parse. Both capturePageview and identify now buffer a single pending call when fired before initAnalytics resolves — otherwise the initial "/" pageview and same-turn login identify race the /api/config fetch and get dropped. resetAnalytics clears both buffers so a logout→login cycle stays clean. * fix(analytics): URL-decode signup_source cookie on read Go does not URL-decode Cookie.Value automatically, so the frontend's JSON-then-encodeURIComponent payload was landing in PostHog as percent-encoded garbage (%7B%22utm_source...). Unescape on read so the backend receives the original JSON string the frontend intended, and drop values that fail to decode or exceed the server-side cap — sending truncated garbage is worse than sending nothing. Oversized-cookie guard matches the frontend's SIGNUP_SOURCE_MAX_LEN. * docs(analytics): reflect nth-issue drop, $pageview wiring, cookie encoding Pulls the schema doc back in line with the code: issue_executed no longer advertises nth_issue_for_workspace (with a note about why PostHog derives it at query time instead), the frontend $pageview section names the actual PageviewTracker component that fires it, and the signup_source section documents the per-value cap / overall drop rule and the encode-on-write / decode-on-read contract. --------- Co-authored-by: Jiang Bohan <bhjiang@outlook.com>
16 lines
788 B
SQL
16 lines
788 B
SQL
-- first_executed_at is stamped atomically the first time an issue's task
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-- reaches a terminal `done` state. Analytics reads this as the single
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-- source of truth for the issue_executed funnel event — atomic UPDATE …
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-- WHERE first_executed_at IS NULL guarantees at-most-one emission per
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-- issue regardless of retries, re-assignments, or comment-triggered
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-- follow-up tasks.
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ALTER TABLE issue
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ADD COLUMN first_executed_at TIMESTAMPTZ NULL;
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-- A partial index on the NULL-until-set column lets the workspace-scoped
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-- "how many issues executed so far?" count (nth_issue_for_workspace)
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-- skip the large tail of never-executed issues.
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CREATE INDEX IF NOT EXISTS idx_issue_first_executed_at
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ON issue (workspace_id, first_executed_at)
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WHERE first_executed_at IS NOT NULL;
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