feat(harness): persist server sessions in postgres

harness/tht/migrations/sessions/001_schema.sql

@@ -0,0 +1,60 @@
+CREATE SCHEMA IF NOT EXISTS thoth_sessions;
+REVOKE ALL ON SCHEMA thoth_sessions FROM PUBLIC;
+
+CREATE TABLE IF NOT EXISTS thoth_sessions.principals (
+    id bigserial PRIMARY KEY,
+    issuer text NOT NULL,
+    subject text NOT NULL,
+    display_name text,
+    created_at timestamptz NOT NULL DEFAULT pg_catalog.now(),
+    updated_at timestamptz NOT NULL DEFAULT pg_catalog.now(),
+    UNIQUE (issuer, subject)
+);
+
+CREATE TABLE IF NOT EXISTS thoth_sessions.principal_preferences (
+    principal_id bigint PRIMARY KEY REFERENCES thoth_sessions.principals(id) ON DELETE CASCADE,
+    preferences jsonb NOT NULL DEFAULT '{}'::jsonb,
+    updated_at timestamptz NOT NULL DEFAULT pg_catalog.now()
+);
+
+CREATE TABLE IF NOT EXISTS thoth_sessions.sessions (
+    id uuid PRIMARY KEY,
+    principal_id bigint NOT NULL REFERENCES thoth_sessions.principals(id),
+    manifest jsonb NOT NULL,
+    created_at timestamptz NOT NULL DEFAULT pg_catalog.now(),
+    updated_at timestamptz NOT NULL DEFAULT pg_catalog.now()
+);
+CREATE INDEX IF NOT EXISTS sessions_principal_id_created_at_idx
+ON thoth_sessions.sessions (principal_id, created_at DESC);
+
+CREATE TABLE IF NOT EXISTS thoth_sessions.session_artifacts (
+    session_id uuid NOT NULL REFERENCES thoth_sessions.sessions(id) ON DELETE CASCADE,
+    artifact_key text NOT NULL,
+    content text NOT NULL,
+    updated_at timestamptz NOT NULL DEFAULT pg_catalog.now(),
+    PRIMARY KEY (session_id, artifact_key)
+);
+
+CREATE TABLE IF NOT EXISTS thoth_sessions.review_decisions (
+    session_id uuid NOT NULL REFERENCES thoth_sessions.sessions(id) ON DELETE CASCADE,
+    seq integer NOT NULL CHECK (seq > 0),
+    ts timestamptz NOT NULL,
+    phase integer,
+    type text NOT NULL,
+    subject text NOT NULL,
+    detail text NOT NULL DEFAULT '',
+    rationale text NOT NULL DEFAULT '',
+    retracts integer,
+    PRIMARY KEY (session_id, seq)
+);
+
+CREATE TABLE IF NOT EXISTS thoth_sessions.audit_log (
+    id bigserial PRIMARY KEY,
+    occurred_at timestamptz NOT NULL DEFAULT pg_catalog.now(),
+    action text NOT NULL,
+    session_id uuid NOT NULL,
+    actor_issuer text NOT NULL,
+    actor_subject text NOT NULL,
+    owner_issuer text NOT NULL,
+    owner_subject text NOT NULL
+);